MathSciNet bibliographic data MR803793 (86k:34001) 34A05 (34B30 70H35) Leach, P. G. L. First integrals for the modified Emden equation $\ddot q+\alpha(t)\dot q+q\sp n=0$$\ddot q+\alpha(t)\dot q+q\sp n=0$. J. Math. Phys. 26 (1985), no. 10, 2510–2514. Article

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