Sergei G. Vorobyov, Andrei Voronkov. Complexity of Nonrecursive Logic Programs with Complex Values. In Proceedings of the Seventeenth ACM SIGACT-SIGMOD-SIGART Symposium on Principles of Database Systems, June 1-3, 1998, Seattle, Washington. pages 244-253, ACM Press, 1998. [doi]
Abstract is missing.