D. Ungar, A. Spitz, and A. Ausch. OOPSLA '05: Companion to the 20th annual ACM SIGPLAN conference on Object-oriented programming, systems, languages, and applications, page 11--20. New York, NY, USA, ACM, (2005)
R. Brooks, R. Gabriel, and J. Steele. LFP '82: Proceedings of the 1982 ACM symposium on LISP and functional programming, page 108--113. New York, NY, USA, ACM, (1982)