@book{402973, title = {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}, language = {cs}, url = {http://dml.mathdoc.fr/item/402973} }
Seifert, Ladislav. Imaginární elementy v geometrii. GDML_Books (1941), http://gdmltest.u-ga.fr/item/402973/