Volume 54, Issue 119, October 2008, Pages 1-8
A. AL-NAEEM; F. HOUSAWI; A. ZAGHAWA; A. AL-AFALEQ
Volume 29.2, Issue 58, July 1993, Pages 78-88
A. ZAGHAWA; S.A. HATTAB; I. GRIESER WILKE; V. MOENNIG