@inbook{400084,
     title = {Preface},
     booktitle = {Bolzano and the Foundations of Mathematical Analysis},
     series = {GDML\_Books},
     publisher = {Society of Czechoslovak Mathematicians and Physicists},
     address = {Praha},
     year = {1981},
     pages = {9-[10]},
     url = {http://dml.mathdoc.fr/item/400084}
}