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Archives of Metallurgy > 2000 > Vol. 45, iss. 1 > 17--32
Studia Geotechnica et Mechanica > 1999 > Vol. 21, nr 1-2 > 15-33
Opuscula Mathematica > 1999 > Vol. 19 > 19-43
Probability and Mathematical Statistics > 1998 > Vol. 18, Fasc. 2 > 335--350
Probability and Mathematical Statistics > 1998 > Vol. 18, Fasc. 2 > 219--245