Ming-Chien Shan, Marie-Anne Neimat. Optimization of relational algebra expressions containing recursion operators. In C. Jinshong Hwang, Richard S. Brice, editors, Proceedings of the 19th annual conference on Computer Science, CSC '91, San Antonio, Texas, USA, March 4-7, 1991. pages 332-341, ACM, 1991. [doi]
Abstract is missing.