Volume 27.2, Issue 54, July 1992, Pages 162-167
R.F. EL-SAYED; A.A. SIAM
Volume 19.2, Issue 38, January 1988, Pages 40-45
A.A. SIAM; S.S. IBRAHIM; H.A.H. SALEM; F.A. SOLIMAN
)
View on SCiNiTO