@inbook{401365,
title = {6. Z\'akladn\'\i\ pojmy o grupoidech},
booktitle = {\'Uvod do teorie grup},
series = {GDML\_Books},
publisher = {Kr\'alovsk\'a \v cesk\'a spole\v cnost nauk},
address = {Praha},
year = {1944},
pages = {28-33},
url = {http://dml.mathdoc.fr/item/401365}
}
(éd.). 6. Základní pojmy o grupoidech, dans Úvod do teorie grup, GDML_Books, (1944), pp. 28-33. http://gdmltest.u-ga.fr/item/401365/