Volume 2, Issue 3.4, May 1975, Pages 122-128
AH. Omar; T.Y. Helal; M.S. Arafa; A.M. Salit; A. Maher Ali
Volume 2, Issue 3.4, May 1975, Pages 130-134
T.Y. Helal; A.H. Omar; M.S. Arafa; A.M. Salit; M. Mahir Ali
Volume 1, Issue 1.2, May 1974, Pages 85-90
M.S. Arafa; A.M. Salit; T.Y. Helal; R.L. Muller