Sylvia L. Osborn The Role of Polymorphism in Schema Evolution in an Object-Oriented Database. 310-317 TKDE1/P0310.pdf 1989 1 IEEE Trans. Knowl. Data Eng. 3 db/journals/tkde/tkde1.html#Osborn89 http://doi.ieeecomputersociety.org/10.1109/69.87977 journals/tois/BanerjeeCGKWBK87 conf/icde/BanerjeeKK88 conf/vldb/ChanDFLNR82 journals/tods/Chen76 ... conf/oopsla/KhoshafianC86 conf/oodbs/Osborn88 conf/oopsla/PenneyS87 journals/tods/Shipman81 journals/cacm/SmithS77 journals/tods/SmithS77 journals/aim/StefikB86