Efficient continued fraction approximations to elementary functions.

1. S. Katz, "Chemical reactions catalyzed on a tube wall," Chem. Eng. Sei. v. 10, 1959, p. 202. 2. L. Graetz, "Über die Warmeleitungs fahigkeit von Flüssigkeiten," Ann. Physik, v. 18, 1883, p. 79. 3. G. M. Brown, "Heat or mass transfer in a fluid in laminar flow in a circular or flat conduit," A. I. Ch. E. J., v. 6, 1960, p. 179. 4. J. B. Sellars, M. Tribus, & J. S. Klein, "Heat transfer to laminar flow in a round tube or flat conduit—the Graetz problem extended," Trans. A. S. M. E., v. 78, 1956, p. 441. 5. F. B. Hildebránd, Introduction to Numerical Analysis, McGraw-Hill Publishing Co., New York, 1956, p. 238. 6. R. Siegel, E. M. Sparrow & T. M. Hallman, "Steady laminar heat transfer in a circular tube with prescribed wall heat flux," Appl. Sei. Res., v. A7, 1958, p. 386.