@article{700074,
     title = {Spectral theory of nonlinear operators},
     booktitle = {Proceedings of Equadiff III},
     series = {GDML\_Books},
     publisher = {Univ. J. E. Purkyn\v e - P\v r\'\i rodov\v edeck\'a fakulta},
     address = {Brno},
     year = {1973},
     pages = {163-174},
     mrnumber = {MR0350551},
     zbl = {0324.47036},
     url = {http://dml.mathdoc.fr/item/700074}
}

Fučík, Svatopluk; Nečas, Jindřich. Spectral theory of nonlinear operators, dans Proceedings of Equadiff III, GDML_Books,  (1973), pp. 163-174. http://gdmltest.u-ga.fr/item/700074/