no. 1
Upper bound for the number of eigenvalues for nonlinear operators
Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 3, Tome 27 (1973) no. 1, pp. 53-71. 
@article{ASNSP_1973_3_27_1_53_0,
     author = {Fu\v{c}ik, S. and Ne\v{c}as, J. and Sou\v{c}ek, J. and Sou\v{c}ek, V.},
     title = {Upper bound for the number of eigenvalues for nonlinear operators},
     journal = {Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche},
     pages = {53--71},
     publisher = {Scuola normale superiore},
     volume = {Ser. 3, 27},
     number = {1},
     year = {1973},
     mrnumber = {372918},
     zbl = {0263.58007},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1973_3_27_1_53_0/}
}
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Fučik, S.; Nečas, J.; Souček, J.; Souček, V. Upper bound for the number of eigenvalues for nonlinear operators. Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 3, Tome 27 (1973) no. 1, pp. 53-71. http://www.numdam.org/item/ASNSP_1973_3_27_1_53_0/

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