Remarks on Characteristic Values and Associated Solutions of Mathieus Differential Equation, Exponential Integral, and Systems of Hyperbolic P. (Algorithms R352, R385, R392) CACM December, 1972 Frisch, M. J. ANSI Fortran standard 4.0 4.22 CA721219 JB January 27, 1978 8:56 AM 2236 5 2236 2236 5 2236 2236 5 2236