Maintainer: ‘Ludovik Çoba <Ludovik.Coba@inf.unibz.it>’

Found the following URLs which should use \doi (with the DOI name only):
  File ‘rrecsys.Rd’:
    http://dx.doi.org/10.1109/MC.2009.263
checkRd: (-1) rrecsys.Rd:72: Lost braces; missing escapes or markup?
    72 |  The average deviation rating $dev_{ij}$ between co-rated items is defined by:
       |                                    ^
checkRd: (-1) rrecsys.Rd:76: Lost braces; missing escapes or markup?
    76 |  Where $c_{ij}$ is the number of co-ratings between items $i$ and $j$ and $r_{ui}$ is an existing rating for user $u$ on item $i$. The Weighted Slope One takes into account both, information from users who rated the same item and the number of observed ratings.
       |           ^
checkRd: (-1) rrecsys.Rd:76: Lost braces; missing escapes or markup?
    76 |  Where $c_{ij}$ is the number of co-ratings between items $i$ and $j$ and $r_{ui}$ is an existing rating for user $u$ on item $i$. The Weighted Slope One takes into account both, information from users who rated the same item and the number of observed ratings.
       |                                                                              ^
Maintainer: ‘Ludovik Çoba <Ludovik.Coba@inf.unibz.it>’

Found the following URLs which should use \doi (with the DOI name only):
  File ‘rrecsys.Rd’:
    http://dx.doi.org/10.1109/MC.2009.263
checkRd: (-1) rrecsys.Rd:72: Lost braces; missing escapes or markup?
    72 |  The average deviation rating $dev_{ij}$ between co-rated items is defined by:
       |                                    ^
checkRd: (-1) rrecsys.Rd:76: Lost braces; missing escapes or markup?
    76 |  Where $c_{ij}$ is the number of co-ratings between items $i$ and $j$ and $r_{ui}$ is an existing rating for user $u$ on item $i$. The Weighted Slope One takes into account both, information from users who rated the same item and the number of observed ratings.
       |           ^
checkRd: (-1) rrecsys.Rd:76: Lost braces; missing escapes or markup?
    76 |  Where $c_{ij}$ is the number of co-ratings between items $i$ and $j$ and $r_{ui}$ is an existing rating for user $u$ on item $i$. The Weighted Slope One takes into account both, information from users who rated the same item and the number of observed ratings.
       |                                                                              ^
checkRd: (-1) rrecsys.Rd:72: Lost braces; missing escapes or markup?
    72 |  The average deviation rating $dev_{ij}$ between co-rated items is defined by:
       |                                    ^
checkRd: (-1) rrecsys.Rd:76: Lost braces; missing escapes or markup?
    76 |  Where $c_{ij}$ is the number of co-ratings between items $i$ and $j$ and $r_{ui}$ is an existing rating for user $u$ on item $i$. The Weighted Slope One takes into account both, information from users who rated the same item and the number of observed ratings.
       |           ^
checkRd: (-1) rrecsys.Rd:76: Lost braces; missing escapes or markup?
    76 |  Where $c_{ij}$ is the number of co-ratings between items $i$ and $j$ and $r_{ui}$ is an existing rating for user $u$ on item $i$. The Weighted Slope One takes into account both, information from users who rated the same item and the number of observed ratings.
       |                                                                              ^
checkRd: (-1) rrecsys.Rd:72: Lost braces; missing escapes or markup?
    72 |  The average deviation rating $dev_{ij}$ between co-rated items is defined by:
       |                                    ^
checkRd: (-1) rrecsys.Rd:76: Lost braces; missing escapes or markup?
    76 |  Where $c_{ij}$ is the number of co-ratings between items $i$ and $j$ and $r_{ui}$ is an existing rating for user $u$ on item $i$. The Weighted Slope One takes into account both, information from users who rated the same item and the number of observed ratings.
       |           ^
checkRd: (-1) rrecsys.Rd:76: Lost braces; missing escapes or markup?
    76 |  Where $c_{ij}$ is the number of co-ratings between items $i$ and $j$ and $r_{ui}$ is an existing rating for user $u$ on item $i$. The Weighted Slope One takes into account both, information from users who rated the same item and the number of observed ratings.
       |                                                                              ^
checkRd: (-1) rrecsys.Rd:72: Lost braces; missing escapes or markup?
    72 |  The average deviation rating $dev_{ij}$ between co-rated items is defined by:
       |                                    ^
checkRd: (-1) rrecsys.Rd:76: Lost braces; missing escapes or markup?
    76 |  Where $c_{ij}$ is the number of co-ratings between items $i$ and $j$ and $r_{ui}$ is an existing rating for user $u$ on item $i$. The Weighted Slope One takes into account both, information from users who rated the same item and the number of observed ratings.
       |           ^
checkRd: (-1) rrecsys.Rd:76: Lost braces; missing escapes or markup?
    76 |  Where $c_{ij}$ is the number of co-ratings between items $i$ and $j$ and $r_{ui}$ is an existing rating for user $u$ on item $i$. The Weighted Slope One takes into account both, information from users who rated the same item and the number of observed ratings.
       |                                                                              ^
checkRd: (-1) rrecsys.Rd:72: Lost braces; missing escapes or markup?
    72 |  The average deviation rating $dev_{ij}$ between co-rated items is defined by:
       |                                    ^
checkRd: (-1) rrecsys.Rd:76: Lost braces; missing escapes or markup?
    76 |  Where $c_{ij}$ is the number of co-ratings between items $i$ and $j$ and $r_{ui}$ is an existing rating for user $u$ on item $i$. The Weighted Slope One takes into account both, information from users who rated the same item and the number of observed ratings.
       |           ^
checkRd: (-1) rrecsys.Rd:76: Lost braces; missing escapes or markup?
    76 |  Where $c_{ij}$ is the number of co-ratings between items $i$ and $j$ and $r_{ui}$ is an existing rating for user $u$ on item $i$. The Weighted Slope One takes into account both, information from users who rated the same item and the number of observed ratings.
       |                                                                              ^
checkRd: (-1) rrecsys.Rd:72: Lost braces; missing escapes or markup?
    72 |  The average deviation rating $dev_{ij}$ between co-rated items is defined by:
       |                                    ^
checkRd: (-1) rrecsys.Rd:76: Lost braces; missing escapes or markup?
    76 |  Where $c_{ij}$ is the number of co-ratings between items $i$ and $j$ and $r_{ui}$ is an existing rating for user $u$ on item $i$. The Weighted Slope One takes into account both, information from users who rated the same item and the number of observed ratings.
       |           ^
checkRd: (-1) rrecsys.Rd:76: Lost braces; missing escapes or markup?
    76 |  Where $c_{ij}$ is the number of co-ratings between items $i$ and $j$ and $r_{ui}$ is an existing rating for user $u$ on item $i$. The Weighted Slope One takes into account both, information from users who rated the same item and the number of observed ratings.
       |                                                                              ^
checkRd: (-1) rrecsys.Rd:72: Lost braces; missing escapes or markup?
    72 |  The average deviation rating $dev_{ij}$ between co-rated items is defined by:
       |                                    ^
checkRd: (-1) rrecsys.Rd:76: Lost braces; missing escapes or markup?
    76 |  Where $c_{ij}$ is the number of co-ratings between items $i$ and $j$ and $r_{ui}$ is an existing rating for user $u$ on item $i$. The Weighted Slope One takes into account both, information from users who rated the same item and the number of observed ratings.
       |           ^
checkRd: (-1) rrecsys.Rd:76: Lost braces; missing escapes or markup?
    76 |  Where $c_{ij}$ is the number of co-ratings between items $i$ and $j$ and $r_{ui}$ is an existing rating for user $u$ on item $i$. The Weighted Slope One takes into account both, information from users who rated the same item and the number of observed ratings.
       |                                                                              ^
checkRd: (-1) rrecsys.Rd:72: Lost braces; missing escapes or markup?
    72 |  The average deviation rating $dev_{ij}$ between co-rated items is defined by:
       |                                    ^
checkRd: (-1) rrecsys.Rd:76: Lost braces; missing escapes or markup?
    76 |  Where $c_{ij}$ is the number of co-ratings between items $i$ and $j$ and $r_{ui}$ is an existing rating for user $u$ on item $i$. The Weighted Slope One takes into account both, information from users who rated the same item and the number of observed ratings.
       |           ^
checkRd: (-1) rrecsys.Rd:76: Lost braces; missing escapes or markup?
    76 |  Where $c_{ij}$ is the number of co-ratings between items $i$ and $j$ and $r_{ui}$ is an existing rating for user $u$ on item $i$. The Weighted Slope One takes into account both, information from users who rated the same item and the number of observed ratings.
       |                                                                              ^
checkRd: (-1) rrecsys.Rd:72: Lost braces; missing escapes or markup?
    72 |  The average deviation rating $dev_{ij}$ between co-rated items is defined by:
       |                                    ^
checkRd: (-1) rrecsys.Rd:76: Lost braces; missing escapes or markup?
    76 |  Where $c_{ij}$ is the number of co-ratings between items $i$ and $j$ and $r_{ui}$ is an existing rating for user $u$ on item $i$. The Weighted Slope One takes into account both, information from users who rated the same item and the number of observed ratings.
       |           ^
checkRd: (-1) rrecsys.Rd:76: Lost braces; missing escapes or markup?
    76 |  Where $c_{ij}$ is the number of co-ratings between items $i$ and $j$ and $r_{ui}$ is an existing rating for user $u$ on item $i$. The Weighted Slope One takes into account both, information from users who rated the same item and the number of observed ratings.
       |                                                                              ^
checkRd: (-1) rrecsys.Rd:72: Lost braces; missing escapes or markup?
    72 |  The average deviation rating $dev_{ij}$ between co-rated items is defined by:
       |                                    ^
checkRd: (-1) rrecsys.Rd:76: Lost braces; missing escapes or markup?
    76 |  Where $c_{ij}$ is the number of co-ratings between items $i$ and $j$ and $r_{ui}$ is an existing rating for user $u$ on item $i$. The Weighted Slope One takes into account both, information from users who rated the same item and the number of observed ratings.
       |           ^
checkRd: (-1) rrecsys.Rd:76: Lost braces; missing escapes or markup?
    76 |  Where $c_{ij}$ is the number of co-ratings between items $i$ and $j$ and $r_{ui}$ is an existing rating for user $u$ on item $i$. The Weighted Slope One takes into account both, information from users who rated the same item and the number of observed ratings.
       |                                                                              ^
checkRd: (-1) rrecsys.Rd:72: Lost braces; missing escapes or markup?
    72 |  The average deviation rating $dev_{ij}$ between co-rated items is defined by:
       |                                    ^
checkRd: (-1) rrecsys.Rd:76: Lost braces; missing escapes or markup?
    76 |  Where $c_{ij}$ is the number of co-ratings between items $i$ and $j$ and $r_{ui}$ is an existing rating for user $u$ on item $i$. The Weighted Slope One takes into account both, information from users who rated the same item and the number of observed ratings.
       |           ^
checkRd: (-1) rrecsys.Rd:76: Lost braces; missing escapes or markup?
    76 |  Where $c_{ij}$ is the number of co-ratings between items $i$ and $j$ and $r_{ui}$ is an existing rating for user $u$ on item $i$. The Weighted Slope One takes into account both, information from users who rated the same item and the number of observed ratings.
       |                                                                              ^
checkRd: (-1) rrecsys.Rd:72: Lost braces; missing escapes or markup?
    72 |  The average deviation rating $dev_{ij}$ between co-rated items is defined by:
       |                                    ^
checkRd: (-1) rrecsys.Rd:76: Lost braces; missing escapes or markup?
    76 |  Where $c_{ij}$ is the number of co-ratings between items $i$ and $j$ and $r_{ui}$ is an existing rating for user $u$ on item $i$. The Weighted Slope One takes into account both, information from users who rated the same item and the number of observed ratings.
       |           ^
checkRd: (-1) rrecsys.Rd:76: Lost braces; missing escapes or markup?
    76 |  Where $c_{ij}$ is the number of co-ratings between items $i$ and $j$ and $r_{ui}$ is an existing rating for user $u$ on item $i$. The Weighted Slope One takes into account both, information from users who rated the same item and the number of observed ratings.
       |                                                                              ^