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JOURNAL OF ALGEBRA, vol. 251, no. 2, page. 529 - 537, 2002-05-15

NONLINEAR ANALYSIS-THEORY METHODS & APPLICATIONS, vol. 50, no. 8, page. 1135 - 1151, 2002-10

REVISTA MATEMATICA IBEROAMERICANA, vol. 18, no. 1, page. 231 - 247, 2002-01

COMMUNICATIONS IN CONTEMPORARY MATHEMATICS, vol. 4, no. 3, page. 457 - 465, 2002-08

TOPOLOGY, vol. 41, no. 6, page. 1161 - 1182, 2002-11

SBORNIK MATHEMATICS, vol. 193, no. 5-6, page. 779 - 789, 2002-05

EUROPEAN JOURNAL OF COMBINATORICS, vol. 23, no. 6, page. 683 - 699, 2002-08

COMMUNICATIONS IN ALGEBRA, vol. 30, no. 12, page. 5955 - 5960, 2002-01

ARCHIVE FOR RATIONAL MECHANICS AND ANALYSIS, vol. 163, no. 1, page. 35 - 64, 2002-05

FORUM MATHEMATICUM, vol. 14, no. 5, page. 775 - 795, 2002-01