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• Appell, Jürgen; Conti, G.; Santucci, P.: Alcune osservazioni sul rango numerico per operatori non lineari. (Italian) [Some remarks on numerical ranges for nonlinear operators]. Mathematica Bohemica, vol. 124 (1999), issue 2, pp. 185-192
• Appell, Jürgen: Ein „merkwürdiges” Spektrum für nichtlineare Operatoren. (German) [A "strange" spectrum for nonlinear operators]. Mathematica Bohemica, vol. 124 (1999), issue 2, pp. 221-229
• Feng, W.; Webb, J. R. L.: Surjectivity results for nonlinear mappings without oddness conditions. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 38 (1997), issue 1, pp. 15-28
• Drábek, Pavel: The least eigenvalues of nonhomogeneous degenerated quasilinear eigenvalue problems. (English). Mathematica Bohemica, vol. 120 (1995), issue 2, pp. 169-195
• Chiappinelli, Raffaele: Estimates on the eigenvalues for some nonlinear ordinary differential operators. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 30 (1989), issue 3, pp. 441-446
• Chiappinelli, Raffaele: Remarks on Krasnoselskii bifurcation theorem. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 30 (1989), issue 2, pp. 235-241
• Švarc, Rudolf: Two examples of the operators with jumping nonlinearities. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 30 (1989), issue 3, pp. 587-620
• Šeda, Valter: Some remarks to coincidence theory. (English). Czechoslovak Mathematical Journal, vol. 38 (1988), issue 3, pp. 554-572
• Resler, Jaroslav: Stability of eigenvalues and eigenvectors of variational inequalities. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 29 (1988), issue 3, pp. 541-550
• Invernizzi, Sergio: A note on nonuniform nonresonance for jumping nonlinearities. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 27 (1986), issue 2, pp. 285-291
• Pacella, Filomena: Note on spectral theory of nonlinear operators: Extensions of some surjectivity theorems of Fučík and Nečas. (English). Czechoslovak Mathematical Journal, vol. 34 (1984), issue 1, pp. 28-45
• Drábek, Pavel: Remarks on nonlinear noncoercive problems with jumping nonlinearities. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 25 (1984), issue 3, pp. 373-399
• Hahn, Siegfried: Eigenwertaussagen für kompakte und kondensierende mengenwertige Abbildungen in topologischen Vektorräumen. (German) [Eigenvalue theorems for compact and condensing set-valued maps in topological vector spaces]. Commentationes Mathematicae Universitatis Carolinae, vol. 20 (1979), issue 1, pp. 123-141