Merrett, T. H. "Persistence and Aldat" pp173-188

Data Types and Persistence. (1988) Data Types and Persistence. Atkinson, MP, Buneman, OP, Morrison, R (eds), Proc. 1st Workshop on Persistent Object Systems, Appin, Scotland, 1985. In Series: Topics in Information Systems. Springer-Verlag, ISBN 3-540-18785-5. 1988  

Languages mentioned Aldat {1989} Database language, based on extended algebra