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Control and Cybernetics > 2000 > Vol. 29, no 2 > 555-565
Archives of Control Sciences > 2000 > Vol. 10, no. 1/2 > 47-60
Probability and Mathematical Statistics > 1998 > Vol. 18, Fasc. 1 > 101--117
Demonstratio Mathematica > 1998 > Vol. 31, nr 4 > 789-800
Matematyka Stosowana : matematyka dla społeczeństwa > 1997 > Nr 40 > 31--39