@inbook{401368, title = {9. V\v ety o isomorfismu grupoid\r u}, booktitle = {\'Uvod do teorie grup}, series = {GDML\_Books}, publisher = {Kr\'alovsk\'a \v cesk\'a spole\v cnost nauk}, address = {Praha}, year = {1944}, pages = {42-45}, url = {http://dml.mathdoc.fr/item/401368} }
(éd.). 9. Věty o isomorfismu grupoidů, dans Úvod do teorie grup, GDML_Books, (1944), pp. 42-45. http://gdmltest.u-ga.fr/item/401368/