Szukana fraza: [Abstract = "This paper describes the effects of a magnetic field on unsteady free convection oscillatory systems. When temperature and species concentration fluctuate with time around a non\-zero constant, \"Couette flow\" across a porous medium occurs. The system of non\-linear ODEs that governs the flow is solved analytically using the perturbation approach because the amplitude of fluctuations is very tiny."]

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