Volume 45.2, Issue 90, July 2001, Pages 178-189
Nagah M. Saad; D.A. Salem; M.S. Sabreen
Volume 44.1, Issue 87, October 2000, Pages 295-309
D.A. Salem
Volume 39.2, Issue 78, July 1998, Pages 130-144
D.A. Salem; S.Kh. Abd Elghaffar
Volume 39.1, Issue 77, April 1998, Pages 192-200
D.A. Salem