V. Wiktor Marek, Helena Rasiowa. Approximating sets with equivalence relations. In Zbigniew W. Ras, Maria Zemankova, editors, Proceedings of the ACM SIGART International Symposium on Methodologies for Intelligent Systems, ISMIS 1986, Knoxville, Tennessee, USA, October 22-24, 1986. pages 190-200, ACM, 1986. [doi]
Abstract is missing.