Naur, Peter "The Progress of ALGOL in Europe"

[Proceedings] (1961) Proceedings of the 1961 Computer Applications Symposium, Armour Research Foundation, Illinois Institute of Technology, Chicago, Illinois  

Languages mentioned ALCOR {1961} ALCOR-Gruppe ALGOL ALGOL 60 {1959} Algorithm Language RegneCentralen ALGOL {1960} Danish family of Algol 60 languages X1 Algol 60  {1961}