Classification of Actions, or Inheritance also for Methods.

Bent Bruun Kristensen Ole Lehrmann Madsen Birger Møller-Pedersen Kristen Nygaard Classification of Actions, or Inheritance also for Methods. 98-107 http://link.springer.de/link/service/series/0558/bibs/0276/02760098.htm 1987 conf/ecoop/1987 ECOOP db/conf/ecoop/ecoop87.html#KristensenMMN87