%0 Journal Article
%F LSAS77
%A Liskov, Barbara
%A Snyder, Alan
%A Atkinson, Russell
%A Schaffert, Craig
%T Abstraction mechanisms in CLU
%J Communications of the ACM
%V 20
%N 8
%D 1977
%U http://www.cs.berkeley.edu/~jcondit/pl-prelim/liskov77clu.pdf