Volume 43.2, Issue 86, July 2000, Pages 395-304
A.A. Al-Qarawi; H.A. Youssef
Volume 42.1, Issue 83, October 1999, Pages 271-277
H.A. Youssef
Volume 41.2, Issue 82, July 1999, Pages 181-193
H.A. Youssef
Volume 41.2, Issue 82, July 1999, Pages 194-201
H.A. Youssef
Volume 39.2, Issue 78, July 1998, Pages 194-200
M.A. Sobeih; H.A. Youssef; M. Al-Saif