1. Ueber die Wärmeleitungsfähigkeit von Flussigkeiten;Graetz;Ann. Phys. Chem., Part 1,1883
2. Ueber die Wärmeleitungsfähigkeit von Flussigkeiten;Graetz;Ann. Phys. Chem., Part 2,1885
3. Heat dissipation of parallel plates by free convection;Elenbaas;Physica,1942
4. S. Ostrach, Combined natural and forced convection laminar flow and heat transfer of fluids with and without heat sources in channels with linearly varying wall temperature, NACA TN 3141, 1954.
5. Advances in Heat Transfer, Supplement 1;Shah,1978