@inbook{402729,
title = {\'Uvahy pomocn\'e},
booktitle = {\'Uvod do neeukleidovsk\'e geometrie},
series = {GDML\_Books},
publisher = {Jednota \v Ceskoslovensk\'ych matematik\r u a fysik\r u},
address = {Praha},
year = {1926},
pages = {183-[203]},
url = {http://dml.mathdoc.fr/item/402729}
}
(éd.). Úvahy pomocné, dans Úvod do neeukleidovské geometrie, GDML_Books, (1926), pp. 183-[203]. http://gdmltest.u-ga.fr/item/402729/