50-20
- : One generalization of the fourth harmonic point (Preliminary communication). (English). Commentationes Mathematicae Universitatis Carolinae, vol. 8 (1967), issue 3, pp. 463-467
- : Coordinatization of parallel systems. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 7 (1966), issue 3, pp. 325-334
- : On Lenz's problem on the independence of the axioms of affine space. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 6 (1965), issue 3, pp. 339-346
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