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- : 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
- : Faktorisierungsmethode für ein Eigenwertproblem eines linearen Systems von Differentialgleichungen. (German) [Factorization method for an eigenvalue problem for a linear system of differential equations]. Aplikace matematiky, vol. 13 (1968), issue 2, pp. 199-200
- : Faktorisierungsmethode für ein Randwertproblem eines linearen Systems von Differentialgleichungen. (German) [Factorization method for a boundary value problem for a linear system of differential equations]. Aplikace matematiky, vol. 13 (1968), issue 2, pp. 191-198
- : Faktorisierungsmethode für ein Randwertproblem eines nichtlinearen Systems von Differentialgleichungen. (German) [Factorization method for a boundary value problem for a non-linear system of differential equations]. Aplikace matematiky, vol. 13 (1968), issue 2, pp. 201-202
- : Universal almost optimal formulae for solutions of boundary-value problems for ordinary differential equations. (English). Aplikace matematiky, vol. 13 (1968), issue 2, pp. 163-167
- : On factorization method. (English). Aplikace matematiky, vol. 11 (1966), issue 6, pp. 427-451
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