Annihilators of nilpotent elements. Klein, Abraham A. — 2005 International Journal of Mathematics and Mathematical Sciences
A combinatorial commutativity property for rings. Bell, Howard E.; Klein, Abraham A. — 2002 International Journal of Mathematics and Mathematical Sciences
On some center-like subsets of groups. Klein, Abraham A.; Bell, Howard E. — 2003 International Journal of Mathematics and Mathematical Sciences
Noncommutativity and noncentral zero divisors. Bell, Howard E.; Klein, Abraham A. — 1999 International Journal of Mathematics and Mathematical Sciences
Some small-centralizer properties for rings. Bell, Howard E.; Klein, Abraham A. — 2010 Beiträge zur Algebra und Geometrie
A commutativity-or-finiteness condition for rings. Klein, Abraham A.; Bell, Howard E. — 2004 International Journal of Mathematics and Mathematical Sciences