Volume 26.1, Issue 51, October 1991, Pages 250-256
M.M. KASSEM; D.R. NELSON; H.A. YOUSSEF
Volume 25.2, Issue 50, July 1991, Pages 160-168
H.A. YOUSSEF; D.R. NELSON; M.M. KASSEM
Volume 25.2, Issue 50, July 1991, Pages 205-210
M.M. KASSEM; D.R. NELSON; H.A. YOUSSEF