[1] Andres J.: Note to the paper of Fučík and Mawhin. Comment. Math. Univ. Carolinae 31, 2 (1990), 223-226. MR 1077892 | Zbl 0715.34080

[2] Andres J.: Large-period forced oscillations to higher-order pendulum-type equations. Diff. Equations and Dynam. Systems 3, 4 (1995), 407-421. MR 1386758 | Zbl 0878.34023

[3] Andres J., Gabor G., Górniewicz L.: Boundary value problems on infinite intervals. To appear in Trans. Amer. Math. Soc. MR 1603870

[4] Andres J., Krajc B.: Unified approach to bounded, periodic and almost periodic solutions of differential systems. Annal. Math. Silesianae 11 (1997), 39-53. MR 1604867 | Zbl 0899.34029

[5] Andres J., Turský T.: Asymptotic estimates of solutions and their derivatives for n-th order nonhomogeneous ordinary differential equations with constant coefficients. Discussiones Math. Diff. Inclusions 16, 1 (1996), 75-89. MR 1429037

[6] Cecchi M., Furi M., Marini M.: About the solvability of ordinary differential equations with asymptotic boundary conditions. Boll. U. M. I. (6) 4-C, 1 (1985), 329-345. MR 0805224 | Zbl 0587.34013

[7] Demidowitch B. P.: Lectures on the Mathematical Stability Theory. Nauka, Moscow, 1967, 360-364 (in Russian).

[8] Mawhin J.: Periodic solutions of some perturbed differential equations. Boll. U. M. I. (4) 11, Suppl. 3 (1975), 299-305. MR 0399586 | Zbl 0321.34031

[9] Reissig R.: Perturbation of a certain critical n-th order differential equation. Boll. U. M. I. (4) 11, Suppl. 3 (1975), 131-141. MR 0390379 | Zbl 0317.34033

[10] Šeda V., Nieto J. J., Gera M.: Periodic boundary value problems for nonlinear higher order ordinary differential equations. Appl. Math. Comput. 48 (1992), 71-82. MR 1147728

[11] Ward J. R., Jr.: Asymptotic conditions for periodic solutions of ordinary differential equations. Proceed. Amer. Math. Soc. 81, 3 (1981), 415-420. MR 0597653 | Zbl 0461.34029