@article{05296681,
title = {Quadratic level quasigroup equations with four variables. I.},
journal = {Publications de l'Institut Math\'ematique. Nouvelle S\'erie},
volume = {82(96)},
year = {2007},
pages = {53-67},
doi = {10.2298/PIM0795053K},
zbl = {1229.39035},
language = {en},
url = {http://dml.mathdoc.fr/item/05296681}
}
Krapež, Aleksandar. Quadratic level quasigroup equations with four variables. I.. Publications de l'Institut Mathématique. Nouvelle Série, Tome 82(96) (2007) pp. 53-67. doi : 10.2298/PIM0795053K. http://gdmltest.u-ga.fr/item/05296681/