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In this paper we point out an error in paper [2] and study the asymptotic behavior of the differential equation  \[    L n x + f ( t , x ) = r ( t ) . {L_n}x + f\left ( {t,x} \right ) = r\left ( t \right ).     \]  The results obtained are extensions of some of the results of [2].

proceedings of the american mathematical society

A note on: “The asymptotic behavior of a class of nonlinear differential equations of second order” [Proc. Amer. Math. Soc. 84 (1982), no. 2, 235–236; MR0637175 (83d:34062)] by J. C. Tong