Mario Luca Bernardi Giuseppe A. Di Lucca Analysing Object Type Hierarchies to Identify Crosscutting Concerns. 216-224 2009 FGIT http://dx.doi.org/10.1007/978-3-642-10509-8_25 conf/fgit/2009 db/conf/fgit/fgit2009.html#BernardiL09