G. Specht, B. Freitag, and H. Schütz. Workshop on Programming with Logic Databases (Informal Proceedings), ILPS, volume #1183 of Technical Report, page 124-133. University of Wisconsin, (1993)
B. Freitag, H. Schütz, and G. Specht. Workshop on Programming with Logic Databases (Informal Proceedings), ILPS, volume #1183 of Technical Report, page 166. University of Wisconsin, (1993)