[С-В] H. Cartan F. Bruhat: Sur la structure des sousensembles analytiques réels. Comptes Rendus, vol. 244, 1957, p. 988. MR 0086108

[FNSS 1] S. Fučík J. Nečas J. Souček V. Souček: Upper bound for the numbers of critical levels for nonlinear operators in Banach spaces of the type of second order nonlinear partial differential operators. Journal Funct. Anal. 11, 1972, p. 314-322. DOI 10.1016/0022-1236(72)90072-9 | MR 0341224

[FNSS 2] S. Fučík J. Nečas J. Souček V. Souček: Upper bound for the number of eigenvalues for nonlinear operators. Ann. Scuola Norm. Sup. Pisa, 27, 1973, p. 53 - 71. MR 0372918

[FNSS 3] S. Fučík J. Nečas J. Souček V. Souček: Strenghthening upper bound for the number of critical levels of nonlinear functionals. Comm. Math. Univ. Carol. 13, 1972, p. 297-310. MR 0305169

[FNSS 4] S. Fučík J. Nečas J. Souček V. Souček: New infinite dimensional versions of Morse-Sard theorem. Boll. Unione Mat. Ital. 6, 1972, p. 317-322. MR 0324724

[FNSS 5] S. Fučík J. Nečas J. Souček V. Souček: Remarks on M. A. Krasnoselskij's main bifurcation theorem. (to appear).

[FNSS 6] S. Fučík J. Nečas J. Souček V. Souček: Note to nonlinear spectral theory: Application to the nonlinear integral equations of the Lichtenstein type. (to appear).

[FNSS 7] S. Fučík J. Nečas J. Souček V. Souček: Spectral analysis of nonlinear operators. Lecture Notes in Math., Springer-Verlag, vol. 346.

[G -R] R. C. Gunning H. Rossi: Analytic functions of several complex variables. PrenticeHall, 1965. MR 0180696

[H] M. Hervé: Функции многих комплексных переменных. (Functions of several complex variables), Москва, 1965.

[K] M. Kučera: Hausdorff measure of the set of critical values of functions of the class $C^{k, \alpha}$. Comm. Math. Univ. Carol. 13, 1972, p. 333-350. MR 0305421

[M] J. Milnor: Особые точки комплексных гиперповерхностей. (Singular points of complex hypersurfaces), Москва, 1971. Zbl 0265.10013

[N] R. Narasimhan: Анализ на действительных и комплексных многообразниях. (Analysis on real and complex manifolds), Москва, 1971. Zbl 0257.22014

[F-N] S. Fučík J. Nečas: Ljustennik-Schnirelmann theorem and nonlinear eigenvalue problems. Math. Nachr. 53, 1972, p. 277-289. DOI 10.1002/mana.19720530123 | MR 0333863

[S] A. Sard: The measure of the critical set values of the differentiable mapping. Bull. Am. Math. Soc., 48, 1942, p. 883-890. DOI 10.1090/S0002-9904-1942-07811-6 | MR 0007523

[So] V. Souček: О spektru nelineárních operátorů. (On the spectrum of nonlinear operators), these, Praha 1973.

[Sp] E. Spanier: Алгебраическая топология. Москва, 1971. Zbl 0235.68029

[S-S] J. Souček V. Souček: Morse-Sard theorem for real-analytic functions. Comm. Math. Univ. Carol. 13, 1972, p. 45-51. MR 0308345

[V] M. M. Vajnberg: Variational methods for the study of nonlinear operators. Holden-Day, 1964. MR 0176364 | Zbl 0122.35501

[W-B] H. Whitney F. Bruhat: Quelques propriétés fondamentales des ensembles analytiquesréels. Comment. Math. Helvetici, 33, 1959, p. 132-160. DOI 10.1007/BF02565913 | MR 0102094