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Ortiz-P\'erez and D\'avalos investigated the stability of parallel convectiveflow. From the article it seems that this equations of flow obtained by theauthors. Meanwhile, it is well studied theoretically and experimentally(exactsolution obtained more than half a century ago.

Comment on "Convection in a horizontal fluid layer under an inclined temperature gradient" [Phys. Fluids 23, 084107 (2011)]