Antonacci, F.; Dell'Orco, P.; Spadavecchia, V. N.; and Turtur, A. "Structure and implementation of a relational query language for the problem solver"

Proceedings of the 3rd conference on very large da (1977) Proceedings of the 3rd conference on very large data bases (Tokyo, Japan, Oct. 6-8, 1977), IEEE, New York, ACM, New York, 1977  

Languages mentioned AQL {1977} APL with picture primitives