%0 Conference Proceedings %F CC77 %A Cousot, Patrick %A Cousot, Radhia %T Abstract interpretation: A unified lattice model for static analysis of programs by contruction or approximation of fixed points %B Fourth ACM Symposium on Principles of Programming Languages %C Los Angeles, California %D 1977 %U http://www.cs.berkeley.edu/~jcondit/pl-prelim/cousot77abstract.pdf