@article{AUCMP_1975__16_2_a7,
     author = {Kepka, Tom\'a\v{s}},
     title = {Normal congruence relations on division groupoids},
     journal = {Acta Universitatis Carolinae. Mathematica et Physica},
     pages = {89--95},
     publisher = {mathdoc},
     volume = {16},
     number = {2},
     year = {1975},
     mrnumber = {0382485},
     zbl = {0319.20066},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUCMP_1975__16_2_a7/}
}