The Syntax and Semantics of the Proposed International Algebraic Language of Zurich ACM-GAMM Conference (1959), Retrieved from: http://www
Backus, J.W.: The Syntax and Semantics of the Proposed International Algebraic Language of Zurich ACM-GAMM Conference (1959), Retrieved from:
http://www.softwarepreservation.org/projects/ALGOL/paper/Backus-Syntax_and_Semantics_of_Proposed_IAL.pdf/view
1959