Open Access System for Information Sharing

COMMUNICATIONS IN ALGEBRA, vol. 28, no. 5, page. 2533 - 2542, 2000-01

COMMUNICATIONS IN ALGEBRA, vol. 34, no. 9, page. 3153 - 3165, 2006-01

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

COMMUNICATIONS IN ALGEBRA, vol. 31, no. 12, page. 5755 - 5768, 2003-01