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• 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
• Ibrahim, Sobhy El-sayed: On $L^2_w$-quasi-derivatives for solutions of perturbed general quasi-differential equations. (English). Czechoslovak Mathematical Journal, vol. 49 (1999), issue 4, pp. 877-890
• Lazhari, M. N.: Paley-Wiener theorems for the Schrodinger operator on $\Bbb R$. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 39 (1998), issue 2, pp. 227-235
• 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
• Fraňková, Dana; Schwabik, Štefan: Generalized Sturm-Liouville equations. II. (English). Czechoslovak Mathematical Journal, vol. 38 (1988), issue 3, pp. 531-553
• Drábek, Pavel: A resonance problem for nonlinear Duffing equation. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 29 (1988), issue 2, pp. 205-215
• Došlý, Ondřej: Representation of solutions of general linear differential systems of the second order. (English). Czechoslovak Mathematical Journal, vol. 35 (1985), issue 3, pp. 444-454
• Drábek, Pavel: Remarks on nonlinear noncoercive problems with jumping nonlinearities. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 25 (1984), issue 3, pp. 373-399
• Wray, S. D.: Absolutely convergent expansions associated with a boundary-value problem with the eigenvalue parameter contained in one boundary condition. (English). Czechoslovak Mathematical Journal, vol. 32 (1982), issue 4, pp. 608-622
• Everitt, William Norrie; Wray, S. D.: A singular spectral identity and inequality involving the Dirichlet integral of an ordinary differential expression. (English). Czechoslovak Mathematical Journal, vol. 32 (1982), issue 4, pp. 589-607
• Úlehla, Ivan; Havlíček, Miloslav: New method for computation of discrete spectrum of radical Schrödinger operator. (English). Aplikace matematiky, vol. 25 (1980), issue 5, pp. 358-372
• Elschner, Johannes; Silbermann, Bernd: Eine Klasse entarteter gewöhnlicher Differentialgleichungen und das Kollokationsverfahren zu ihrer Lösung. (German) [A class of degenerate ordinary differential equations and the collocation method for their solution]. Czechoslovak Mathematical Journal, vol. 29 (1979), issue 4, pp. 551-563
• Brown, Richard C.; Krall, Allan M.: $n$-th order ordinary differential systems under Stieltjes boundary conditions. (English). Czechoslovak Mathematical Journal, vol. 27 (1977), issue 1, pp. 119-131
• Brown, Richard C.; Krall, Allan M.: On minimizing the sum of squares of $\Cal L^2$ norms of differential operators under constraints. (English). Czechoslovak Mathematical Journal, vol. 27 (1977), issue 1, pp. 132-143
• Everitt, William Norrie; Giertz, Magnus: On the limit-3 classification of the square of a second-order, linear differential expression. (English). Czechoslovak Mathematical Journal, vol. 26 (1976), issue 4, pp. 653-665
• Barnovská, Mária: О спектре несамосопряженного дифференциального оператора второго порядка с комплекснозначным переменным коэффициентом при старшей производной на полуоси. (Russian) [The spectrum of a nonselfadjoint second order differential operator on the half-axis, with a complex-valued variable coefficient for the highest derivative]. Czechoslovak Mathematical Journal, vol. 24 (1974), issue 3, pp. 349-358
• Kratochvíl, Alexander; Nečas, Jindřich: О дискретности спектра нелинейного уравнения Штурма - Лиувилля четвертого порядка. (Russian) [The discreteness of the spectrum of a nonlinear Sturm-Liouville equation of fourth order]. Commentationes Mathematicae Universitatis Carolinae, vol. 12 (1971), issue 4, pp. 639-653