Leo Ferres Petro Verkhogliad Livia Sumegi Louis Boucher Martin Lachance Gitte Lindgaard A syntactic analysis of accessibility to a corpus of statistical graphs. 37-44 2008 W4A http://doi.acm.org/10.1145/1368044.1368053 conf/w4a/2008 db/conf/w4a/w4a2008.html#FerresVSBLL08