@inbook{402955,
     title = {6. Ne\v re\v sitelnost rovnic vy\v s\v s\'\i ho ne\v z \v ctvrt\'eho stupn\v e},
     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 = {67-78},
     url = {http://dml.mathdoc.fr/item/402955}
}