1. Coppage, J. E. and A. L. London, Trans. Amer. Soc. Mech. Engrs (1953) 779.
2. Nusselt, W., Z. Ver. dtsch. Ing. 71 (1927) 85.
3. Iliffe, C. E., Proc. Instn Mech. Engrs 159 (1948) 363.
4. Lambertson, T. J., Trans. Amer. Soc. Mech. Engrs 159 (1948) 586.
5. Churchill, Ruel V., Modern Operational Mathematics in Engineering, McGraw-Hill Book Cy., Inc., 1944.