1. Combined natural and forced-convection laminar flow and heat transfer of fluids with and without heat sources in channels with linearly varying wall temperatures;Ostrach;N.A.C.A. TN 3141,1954
2. Combined forced and free laminar heat transfer in vertical tubes with uniform internal heat generation;Hallman;Trans. Amer. Soc. Mech. Engrs,1956
3. Laminar heat transfer in rectangular channels;Han;Trans. ASME Heat Transfer,1959
4. On combined free and forced convection in channels;Tao;Trans. ASME Heat Transfer.,1960
5. A variational method for fully developed laminar heat transfer in ducts;Sparrow;Trans. ASME Heat Transfer,1959