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(1) S. Timoshenko and D. H. Young, Advanced dynamics, McGraw-Hill Book Co., Inc., New York, 1948, pp. 114-116. (2) P. Frank and It. v. Mises, Die Differentialund Integralgleichungen der Mechanik und Physik, 2. ed., M. S. Rosenberg, New York, 1943, p. 180. (3) A. G. Greenhill, Proc. Roy. Artillery Inst. 17, 181-226 (1889); or E. Jahnke and F. Emde, Tables of functions, Dover Publications, New York, 1945, pp. 102-104. (The value of f(tt) = 3.7174 for r = 31° is incorrect. A better value is f = 3.7952.)

A note on supersonic flow in the Trefftz plane