@inbook{402949,
     title = {P\v redmluva},
     booktitle = {O rovnic\'\i ch},
     series = {GDML\_Books},
     publisher = {Jednota \v cesk\'ych matematik\r u a fysik\r u v Praze},
     address = {Praha},
     year = {1940},
     pages = {3-[4]},
     url = {http://dml.mathdoc.fr/item/402949}
}