@inproceedings{ICLP-1987-MorishitaNH87,
	author        = "Shinichi Morishita and Masayuki Numao and Shin'ichi Hirose",
	booktitle     = "{Proceedings of the Fourth International Conference on Logic Programming, 2 Volumes}",
	isbn          = "0-262-12125-5",
	pages         = "533--555",
	publisher     = "{MIT Press}",
	title         = "{Symbolical Construction of Truth Value Domain for Logic Program}",
	year          = 1987,
}