Volume 32, APRIL- JUNE, June 2011, Pages 193-204
Ahmed M. A. Harga; Mohamed E. A. Khalifa
Volume 32, APRIL- JUNE, June 2011, Pages 205-214
Mohamed K. A. Abd El-Samie; Mohamed E. A. Khalifa
Volume 30, APRIL- JUNE, June 2009, Pages 299-308
Mohamed E. A. Khalifa