@article{104578,
author = {V\'aclav Havel},
title = {Unessential Zassenhaus refinements},
journal = {Archivum Mathematicum},
volume = {001},
year = {1965},
pages = {35-38},
zbl = {0188.04204},
mrnumber = {0194367},
language = {en},
url = {http://dml.mathdoc.fr/item/104578}
}
Havel, Václav. Unessential Zassenhaus refinements. Archivum Mathematicum, Tome 001 (1965) pp. 35-38. http://gdmltest.u-ga.fr/item/104578/
Grundlagen der Gruppoid- und Gruppentheorie, Berlin 1960. (1960) | MR 0117267
On semichained refinements of chains in equivalence lattice, Czech. Mat. Journ. 13 (1963), pp. 533-538. (1963) | MR 0157915 | Zbl 0135.03102
Properties of the Zassenhaus refinements, (in russian), Czech. Mat. Journ. 3 (1953), pp. 159-180. (1953) | MR 0060466
Application des méthodes mathématique a la theorie des clasifications, Publ. Fac. Sci. Univ. Brno, No 316, pp. 1-39 (1949). (1949) | MR 0039677