@inbook{400202, title = {19. 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 = {103-104}, url = {http://dml.mathdoc.fr/item/400202} }
Bolzano, Bernard. 19. Bolzano an Exner, dans Bernard Bolzano's Schriften, GDML_Books, (1935), pp. 103-104. http://gdmltest.u-ga.fr/item/400202/