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• Quittner, Pavol: Spectral analysis of variational inequalities [Abstract of thesis]. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 29 (1988), issue 1, pp. 199
• Resler, Jaroslav: Stability of eigenvalues and eigenvectors of variational inequalities. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 29 (1988), issue 3, pp. 541-550
• Neumann, Jan: An abstract differential inequality and eigenvalues of variational inequalities. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 28 (1987), issue 2, pp. 277-293
• Quittner, Pavol: Spectral analysis of variational inequalities. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 27 (1986), issue 3, pp. 605-629
• Quittner, Pavol: A note to E. Miersemann's papers on higher eigenvalues of variational inequalities. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 26 (1985), issue 4, pp. 665-674
• Miersemann, Erich: On higher eigenvalues of variational inequalities. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 24 (1983), issue 4, pp. 657-665
• Rektorys, Karel; Vospěl, Zdeněk: On a method of two-sided eigenvalue estimates for elliptic equations of the form $Au-\lambda Bu=0$. (English). Aplikace matematiky, vol. 26 (1981), issue 3, pp. 211-240
• Naumann, Joachim: A characterization of the eigenvalues of a completely continuous selfadjoint operator. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 13 (1972), issue 1, pp. 63-78
• Najzar, Karel: Error bounds for eigenvalues and eigenfunctions of some ordinary differential operators by the method of least squares. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 12 (1971), issue 2, pp. 235-248
• Najzar, Karel: Error-estimates for the Ritz's method of finding eigenvalues and eigenfunctions. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 12 (1971), issue 3, pp. 485-501