SIAM Journal on Applied Mathematics, Vol. 17, No. 3 (May, 1969), pp. 511-515 (5 pages) In this paper, a method of synthesizing the governing differential equations of nonlinear second order systems, ...
Proceedings of the American Mathematical Society, Vol. 79, No. 3 (Jul., 1980), pp. 415-421 (7 pages) Positive solutions of $y^{(n)} \pm f(t, y) = 0$ are characterized ...
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