State space approach to unsteady magnetohydrodynamics natural convection heat and mass transfer through a porous medium saturated with a viscoelastic fluid

2014 ◽  
Vol 55 (4) ◽  
pp. 660-671 ◽  
Author(s):  
M. A. Ezzat ◽  
A. A. El-Bary ◽  
A. S. Hatem
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