@inbook{400219,
title = {Betrachtungen \"uber einige Gegenst\"ande der Elementargeometrie},
booktitle = {Bernard Bolzano's Schriften},
series = {GDML\_Books},
publisher = {Kr\'alovsk\'a \v cesk\'a spole\v cnost nauk v Praze},
address = {Praha},
year = {1948},
pages = {9-12},
url = {http://dml.mathdoc.fr/item/400219}
}
(éd.). Betrachtungen über einige Gegenstände der Elementargeometrie, dans Bernard Bolzano's Schriften, GDML_Books, (1948), pp. 9-12. http://gdmltest.u-ga.fr/item/400219/