1. H. Schlichting,Boundary Layer Theory(McGraw-Hill Book Company, Inc., New York, 1960), 4th ed., p. 59.
2. F. John, inHandbook of Physics, edited by E. Condon and H. Odishaw (McGraw-Hill Book Company, Inc., New York, 1958).
3. S. Timoshenko and S. Woinowsky-Krieger,Theory of Plates and Shells(McGraw-Hill Book Company, Inc., New York, 1959), 2nd ed., pp. 180–228.
4. F. B. Hildebrand,Methods of Applied Mathematics, (Prentice-Hall, Inc., Englewood Cliffs, New Jersey, 1952), pp. 185–186.