Volume 16, Issue 1, May 1991, Pages 57-74
R. A. El-Bealy; M. El-Messiery
Volume 11, Issue 2, December 1986, Pages 1-10
R. El-Bealy; M. Salama; S. Ibrahim
Volume 11, Issue 2, December 1986, Pages 11-20
M. Salama; R. El-Bealy; S. Ibrahim