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34L15 Estimation of eigenvalues, upper and lower bounds (7 articles)

• Yao, Qingliu: Positive solutions and eigenvalue intervals of a nonlinear singular fourth-order boundary value problem. (English). Applications of Mathematics, vol. 58 (2013), issue 1, pp. 93-110
• Telnova, Maria: Some estimates for the first eigenvalue of the Sturm-Liouville problem with a weight integral condition. (English). Mathematica Bohemica, vol. 137 (2012), issue 2, pp. 229-238
• Karulina, Elena: Some estimates for the minimal eigenvalue of the Sturm-Liouville problem with third-type boundary conditions. (English). Mathematica Bohemica, vol. 136 (2011), issue 4, pp. 377-384
• Ibrahim, Sobhy El-sayed: The spectra of general differential operators in the direct sum spaces. (English). Czechoslovak Mathematical Journal, vol. 54 (2004), issue 1, pp. 9-29
• Hilscher, Roman: Spectral properties of general self-adjoint, even order differential operators. (English). Mathematica Slovaca, vol. 50 (2000), issue 2, pp. 165-186
• Tunca, Gülen Başcanbaz; Bairamov, Elgiz: Discrete spectrum and principal functions of non-selfadjoint differential operator. (English). Czechoslovak Mathematical Journal, vol. 49 (1999), issue 4, pp. 689-700
• Shibata, Tetsutaro: Spectral asymptotics for nonlinear multiparameter problems with indefinite nonlinearities. (English). Czechoslovak Mathematical Journal, vol. 49 (1999), issue 2, pp. 317-340