[1] Cañada A., Drábek P.:
On semilinear problems with nonlinearities depending only on derivatives. Západočeská Universita Plzeň, Preprinty vědeckých prací 50 (1994).
MR 1377488
[2] Dłotko T.: On J. Mawhin's paper on second order differential equations. in press.
[3] Fučík S.:
Solvability of nonlinear equations and boundary value problems. Reidel, Dordrecht, 1980.
MR 0620638
[4] Granas A., Guenther R. B., Lee J. W.:
Some general existence principles in the Caratheodory theory of nonlinear differential systems. J. Math.pures et appl. 70 (1991), 153-196.
MR 1103033 |
Zbl 0687.34009
[5] Krasnosielskij M. A.: Topological methods in the theory of nonlinear integral equations. (in Russian), Moscow, 1956.
[6] Mawhin J.:
Some remarks on semilinear problems at resonance, where the nonlinearity depends only on the derivatives. Acta Math, et Inform. Universitatis Ostraviensis 2 (1994), 61-69.
MR 1309064 |
Zbl 0853.34021
[7] Rouche N., Mawhin J.:
Ordinary differential equations. Stability and Periodic solutions. Pitman, Boston, 1980.
MR 0615082 |
Zbl 0433.34001
[8] Sturm C.: Sur les equations differentielles lineaires du second ordre. J. Math. Pure Appl. 1 (1836), 166-186.