@article{100034,
author = {Karel \v Cern\'y},
title = {O minimumakh binarnykh bikvadratnykh form},
journal = {Czechoslovak Mathematical Journal},
volume = {02},
year = {1952},
pages = {1-56},
zbl = {0048.03201},
mrnumber = {0052463},
language = {ru},
url = {http://dml.mathdoc.fr/item/100034}
}
Černý, Karel. О минимумах бинарных биквадратных форм. Czechoslovak Mathematical Journal, Tome 02 (1952) pp. 1-56. http://gdmltest.u-ga.fr/item/100034/