Neelam Soundarajan Stephen Fridella Behavioral Subtyping and Behavioral Enrichment of Multimethods. 105- 2000 conf/tools/34-2000 TOOLS (34) http://doi.ieeecomputersociety.org/10.1109/TOOLS.2000.868963 db/conf/tools/tools34-2000.html#SoundarajanF00