IBM Journal of Research and Development, 22(5) 1978

IBM Journal of Research and Development  

Antonacci, F.; Dell'Orco, P.; Spadavecchia, V. N. (1978) Antonacci, F.; Dell'Orco, P.; Spadavecchia, V. N. and Turtur, A. "AQL: A Problem-solving Query Language for Relational Data Bases"