@inbook{400196,
title = {3. Exner an Bolzano},
booktitle = {Bernard Bolzano's Schriften},
series = {GDML\_Books},
publisher = {Kr\'alovsk\'a \v cesk\'a spole\v cnost nauk},
address = {Praha},
year = {1935},
pages = {18-23},
url = {http://dml.mathdoc.fr/item/400196}
}
Exner, František. 3. Exner an Bolzano, dans Bernard Bolzano's Schriften, GDML_Books, (1935), pp. 18-23. http://gdmltest.u-ga.fr/item/400196/