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Birkhoff, Garrett 1911-1996, et al. Numerical Solutions of Nonlinear Differential Equations: Proceedings of an Advanced Symposium Conducted By the Mathematics Research Center, United States Army, At the University of Wisconsin, Madison, May 9-11, 1966. New York: John Wiley & Sons, Inc., 1966.

Birkhoff, Garrett 1911-1996, et al. Numerical Solutions of Nonlinear Differential Equations: Proceedings of an Advanced Symposium Conducted By the Mathematics Research Center, United States Army, At the University of Wisconsin, Madison, May 9-11, 1966. New York: John Wiley & Sons, Inc., 1966.