Volume 28.1, Issue 55, October 1992, Pages 250-266
A. EL-SEBAIE; W. HOFMANN
Volume 18.1, Issue 35, January 1987, Pages 197-204
A. EL-SEBAIE; W. HOFMANN; A. BA YOUMI
Volume 11.2, Issue 22, January 1984, Pages 161-167
A.H. EL-SEBAIE; H.A. IBRAHIM; A.A. IBRAHIM; W. HOFMANN; A.A. AMER