conf/sigmod/91 Joel E. Richardson Peter M. Schwarz Aspects: Extending Objects to Support Multiple, Independent Roles. 298-307 SIGMOD91/P298.PDF 1991 SIGMOD Conference db/conf/sigmod/sigmod91.html#RichardsonS91 http://doi.acm.org/10.1145/115790.115839 db/conf/sigmod/RichardsonS91.html journals/tois/BanerjeeCGKWBK87 conf/oopsla/BlackHJL86 journals/tse/BlackHJLC87 ... ... conf/sigmod/CareyDV88 ... ... books/aw/EllisS90 journals/tois/FishmanBCCCDDHKLMNRS87 conf/aaai/GoldsteinB80 journals/tods/HudsonK89 conf/sigmod/LecluseRV88 conf/oopsla/Lieberman86 conf/oopsla/MaierSOP86 conf/oopsla/McAllesterZ86 journals/tois/Sciore89 ... conf/dbpl/ShawZ89 ... ... books/aw/Stroustrup86 conf/oopsla/UngarS87