@inbook{400451,
     title = {I. [O \v zivot\v e a \v cinnosti Bernarda Bolzana]},
     booktitle = {Bernard Bolzano a jeho v\'yznam v mathematice},
     series = {GDML\_Books},
     publisher = {UK Praha [?]},
     address = {Praha},
     year = {1926},
     pages = {[1g]-12},
     url = {http://dml.mathdoc.fr/item/400451}
}

Petr, Karel. I. [O životě a činnosti Bernarda Bolzana], dans Bernard Bolzano a jeho význam v mathematice, GDML_Books,  (1926), pp. [1g]-12. http://gdmltest.u-ga.fr/item/400451/