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[1] Andres J.: Periodic derivative of solutions to nonlinear differential equations. to appear in Czech. Math. J. MR 1065015 | Zbl 0727.34029
[2] Andres J.: On the equation x''' + ax'' +bx' + csin x = p(t). to appear in Proceed. Conf. Diff. Eqs. held in Kołobrzeg, 1984.
[3] Fučík S., al.: Spectral Analysis of Nonlinear Operators. Springer, LNM 346, Berlin - Heidelberg - New York, 1973. MR 0467421 | Zbl 0268.47056
[4] Horák R., Peřina J.: Private communication.
[5] Krasnoseĺskii M. A.: Translation Operator along Trajectories of Differential Equations. (Russian), Nauka, Moscow, 1966. MR 0203159
[6] Reissig R.: Continue of periodic solutions of the Liénard equation. Constr. Meth. Nonl. BVPs Nonl. Oscill., ed. J. Albrecht, L.Collatz and K. Kirchgässner, Birkhäuser, Basel, 126-133. MR 0565646
[7] Voráček J.: Über D’ -divergente Lösungen der Differentialgleichung $x^(n)= f(x,x',\ldots,x^{(n-1)}; t). Acta UPO 41, 1973, 83-89. MR 0355221
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