Neil Immerman, Sushant Patnaik, David W. Stemple. The Expressiveness of a Family of Finite Set Languages. In Proceedings of the Tenth ACM SIGACT-SIGMOD-SIGART Symposium on Principles of Database Systems, May 29-31, 1991, Denver, Colorado. pages 37-52, ACM Press, 1991. [doi]
Abstract is missing.