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J.C. Umavathi,  Effect of Time-Periodic Boundary Temperature on the Onset of Nanofluid Convection in a Layer of a Saturated Porous Medium.   journal   = {International Journal of Mathematical, Computational, Physical, Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology. January 2013, vol. 73(1). 191 - 196[viewed 26 April 2018]. Available from: http://waset.org/publications/9996909.