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2. Mathematical theory of the steady heat transfer in a circular vertical hole with superposition of forced and free laminar convection;Ostroumov;J. Tech. Phys.,1950
3. Combined forced and free laminar heat transfer in vertical tubes with uniform internal heat generation;Hallman;Trans. Am. Soc. Mech. Engrs, J. Heat Transfer (C),1956
4. étude nouvelle sur l'équilibre et le mouvement des corps solides élastiques dont certaines dimensions sont trés-petites par rapport à d'autres;Boussinesq;J. Math. Pures Appl. Ser.,1871
5. A note on limiting laminar Nusselt number in ducts with constant temperature gradient by analogy to thin-plate theory;Marco;Trans. Am. Soc. Mech. Engrs, J. Heat Transfer (C),1955