[ACM] CACM 14(01) Jan 1971

(1957) Communications of the ACM  

Bracchi, G.; Ferrari, D. (1971) Bracchi, G.; Ferrari, D. "A language for treating geometric patterns in a two-dimensional space" Branquart, P.; Lewi, J.; Sintzoff, M.and P.L. Wodo (1971) Branquart, P.; Lewi, J.; Sintzoff, M.and P.L. Wodon: "The composition of semantics in Algol 68"