TY - BOOK AU - Rival, Ivan, ed. TI - Algorithms and order: proceedings of the NATO Advanced Study Institute held in Ottawa, Canada, May 31-June 133, 1987iedited by Ivan Rival SN - 0 7923 0007 6 U1 - 511.8 PY - 1989/// CY - Dordrecht PB - Kluwer Academic Publishers ER -