Randall B. Smith Mark Lentczner Walter R. Smith Antero Taivalsaari David Ungar Prototype-based languages: object lessons from class-free programming. 48-53 1994 5 OOPS Messenger 4 db/journals/oopsm/oopsm5.html#SmithLSTU94 http://doi.acm.org/10.1145/260060.260101