35-12
- : Periodic solutions of a weakly nonlinear wave equation in $E_3$ in a spherically symmetrical case. (English). Aplikace matematiky, vol. 14 (1969), issue 2, pp. 160-167
- : Über die Existenz einer periodischen Lösung der nichtlinearen Wellengleichung in $E_2$ (Vorläufige Mitteilung). (German) [On the existence of a periodic solution of the nonlinear wave equation in $E_2$ (Preliminary communication)]. Commentationes Mathematicae Universitatis Carolinae, vol. 10 (1969), issue 3, pp. 421-424
- : Periodic solutions of the first boundary value problem for a linear and weakly nonlinear heat equation. (English). Aplikace matematiky, vol. 13 (1968), issue 6, pp. 466-477
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