Markowltz, H.M., Malhotra, A., and Pazel, D.P. "The ER and EAS formalisms for system modeling and the EAS-E language" pp. 29-48.

Proceedings of the 2nd International Confereence o (1981) Proceedings of the 2nd International Confereence on the Entity-Relationship Approach (Washington, D.C., Oct. 12-14, 1981)  

Languages mentioned EAS-E {1983}