@inbook{402988,
title = {12. Jin\'e imagin\'arn\'\i\ \'utvary v prostoru},
booktitle = {Imagin\'arn\'\i\ elementy v geometrii},
series = {GDML\_Books},
publisher = {Jednota \v cesk\'ych matematik\r u a fysik\r u},
address = {Praha},
year = {1941},
pages = {59-63},
url = {http://dml.mathdoc.fr/item/402988}
}
(éd.). 12. Jiné imaginární útvary v prostoru, dans Imaginární elementy v geometrii, GDML_Books, (1941), pp. 59-63. http://gdmltest.u-ga.fr/item/402988/