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[2] S. Holtzman, J. Breese: Exact reasoning about uncertainty. In: Uncertainty in Artificial Intelligence (L. N. Kanal, J. F. Lemmer, eds.), North-Holland, Amsterdam 1986.

[3] L. Kučera: Combinatorial Algorithms. SNTL -- Nakladatelství technické literatury, Praha 1983. In Czech.