@inbook{400143,
title = {Bernard Bolzano's Schriften [Titelbl\"atter]},
booktitle = {Bernard Bolzano's Schriften},
series = {GDML\_Books},
publisher = {Kr\'alovsk\'a \v cesk\'a spole\v cnost nauk v Praze},
address = {Praha},
year = {1930},
pages = {II-VI},
url = {http://dml.mathdoc.fr/item/400143}
}
Bolzano, Bernard. Bernard Bolzano's Schriften [Titelblätter], dans Bernard Bolzano's Schriften, GDML_Books, (1930), pp. II-VI. http://gdmltest.u-ga.fr/item/400143/