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[1] Andres J.: Existence of periodic solutions for an $n$-th order differential equation with nonlinear restoring term and time-variable coefficients. preprint no. 579, September 1989, University of Utrecht. MR 1165251
[2] Fučík S., Mawhin J.: Periodic solutions of some nonlinear differential equations of higher order. Čas. Pěst. Mat. 100 (1975), 276-283. MR 0385240
[3] Rouche N., Mawhin J.: Équations differentielles ordinaires. (Vol. II), Masson, Paris 1973. MR 0481182 | Zbl 0289.34001
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