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Demonstratio Mathematica > 1998 > Vol. 31, nr 4 > 723-733
Demonstratio Mathematica > 1998 > Vol. 31, nr 4 > 835-840
Applied Mathematics Letters > 1997 > 10 > 6 > 21-28
Applied Mathematics Letters > 1997 > 10 > 4 > 97-100
Applied Mathematics Letters > 1997 > 10 > 4 > 91-95
Fuzzy Sets and Systems > 1997 > 88 > 1 > 107-118
Journal of Computational and Applied Mathematics > 1997 > 79 > 2 > 235-247
Fuzzy Sets and Systems > 1996 > 83 > 3 > 341-346
Applied Mathematics Letters > 1996 > 9 > 3 > 1-7
Statistics and Probability Letters > 1996 > 27 > 3 > 247-254
Fuzzy Sets and Systems > 1996 > 77 > 3 > 349-354
Computers and Mathematics with Applications > 1995 > 30 > 3-6 > 243-253
Statistics and Probability Letters > 1995 > 23 > 3 > 221-226