by L. C. Berselli, Traian Iliescu, William J. Layton
by P. Mohana Shankar
by Vladimir Mityushev, Wojciech Nawalaniec, Natalia Rylko
by John Glenn Paton
by Rene Fester Kratz
by Patrick Marchand
by Cornelius L. Katona, Mary Robertson
by J. Fr�d�ric Bonnans, J. C. Gilbert, Lemar�chal Lemarechale, C. A. Sagastiz�bal
by Kurt St�we
by Xi Jiang, Choi-Hong Lai
by Ivan Stanimirović
by M. W. Frazier
by Dan Liebman, Dan Liebman