Author: Havlíček, Karel
- : Zur Geometrie der endlichen Ebene der Ordnung $n=4$. (German) [On geometry of the finite plane of order $n=4$]. Czechoslovak Mathematical Journal, vol. 21 (1971), issue 1, pp. 157-164
- : Surfaces réglées qui sont enveloppes de sphères. (French) [Ruled surfaces which are envelopes of spheres]. Czechoslovak Mathematical Journal, vol. 1 (1951), issue 3, pp. (187)-197
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