db/journals/db/HigaS89.html Kunihiko Higa Olivia R. Liu Sheng An Object - Oriented Methodology for Database/Knowledgebase Coupling: An Implementation of the Structured Entity Model in Nexpert System. 24-29 DataBase/20-1/P024.pdf 1989 20 DATA BASE 1 db/journals/db/db20.html#HigaS89