1. V. Marič, Regular Variation and Differential Equations, Springer, Berlin (2000.)
2. V. M. Evtukhov and L. A. Kirillova, “On the asymptotics of solutions of nonlinear differential equations of the second order,” Differents. Uravn.,41, No. 8, 1053–1061 (2005).
3. V. M. Evtukhov and V. M. Khar’kov, “Asymptotic representations of solutions of essentially nonlinear second-order differential equations,” Differents. Uravn.,43, No. 9, 1311–1323 (2007).
4. A. G. Chernikova, “Asymptotics of rapidly varying solutions of second-order differential equations with rapidly varying nonlinearity,” Visn. Odes. Nats. Univ. Mat. Mekh.,20, No. 2, 56–68 (2015).
5. V. M. Evtukhov and V. A. Kas’yanov, “Asymptotic behavior of unbounded solutions of essentially nonlinear second-order differential equations. I,” Ukr. Mat. Zh.,57, No. 3, 338–355 (2005); English translation:Ukr. Math. J.,57, No. 3, 406–426 (2005).