Andreas Dieckow
Plain Old Java Persistence with Caché
4, Volume 4, Issue 2
Anthony I. Wasserman, David D. Sherertz, M.L. Kersten, R.P. van de Riet and M.D. Dippe
Revised Report of the Programming Language PLAIN
ACM SIGPLAN Notes, volume 16, number 5 (1981), pp59-80