[1]
“$CLIP^{++}$: an object-oriented extension of a relational DBMS”, Ann. Sofia Univ. Fac. Math. and Inf., vol. 85, pp. 107–119, Dec. 1993, Accessed: Dec. 14, 2025. [Online]. Available: https://annual.uni-sofia.bg/index.php/fmi/article/view/459