Volume 40, Issue 1, 2017, Pages 9-31
A. A. Khalifa; A. A. Mohamed; Z. Z. Ibrheim; A. M. A. Hamoda
Volume 38, Issue 1, 2015, Pages 99-125
A. M. El-Moghazy; A. A. Khalifa; S. A. L. Bayoumi; H. M. B. Sayed
Volume 24, Issue 2, December 2001, Pages 145-151
A. A. Khalifa; D. T. A. Youssef
Volume 24, Issue 2, December 2001, Pages 173-199
N. A. El-Emary; A. A. Khalifa; E. Y. Backheet; W. M. Abdel-Mageed
Volume 24, Issue 1, June 2001, Pages 41-45
A. A. Khalifa
Volume 23, Issue 2, December 2000, Pages 117-123
A. A. Khalifa
Volume 23, Issue 2, December 2000, Pages 177-186
Z. Z. lbraheim; A. A. Khalifa
Volume 13, Issue 2, December 1990, Pages 205-220
A. A. Khalifa; O. M. Abdallah
Volume 12, Issue 1, June 1989, Pages 103-116
M. A. Ramadan; A. A. Khalifa