@inbook{400183,
     title = {27. Bolzano an Exner},
     booktitle = {Bernard Bolzano's Schriften},
     series = {GDML\_Books},
     publisher = {Kr\'alovsk\'a \v cesk\'a spole\v cnost nauk},
     address = {Praha},
     year = {1935},
     pages = {119-119},
     url = {http://dml.mathdoc.fr/item/400183}
}