1. Zur Berechnung der laminaren Einlaufströmung im Rohr;Punnis,1947
2. Steady flow in the transition length of a straight tube;Langhaar;Trans. Amer. Soc. Mech. Engrs,1942
3. Numerical solutions for laminar-flow heat transfer in circular tubes;Kays;Trans. Amer. Soc. Mech. Engrs,1955
4. Heat, Mass, and Momentum Transfer;Rohsenow,1961