1. Assignment and procedure call proof rules;Gries;ACM Trans. Programming Languages Syst.,1980
2. An axiomatic definition of the programming language PASCAL;Hoare;Acta Inform.,1973
3. A fast algorithm for computing longest common subsequences;Hunt;Comm. ACM,1977
4. A general axiom of assignment;Morris,1981
5. Assignment and linked data structures;Morris,1981