@inbook{402693,
     title = {V. P\v rehled o funkc\'\i ch element\'arn\'\i ch. Funkcion\'aln\'\i\ rovnice},
     booktitle = {Po\v cet differenci\'aln\'\i },
     series = {GDML\_Books},
     publisher = {Jednota \v ceskoslovensk\'ych mathematik\r u a fysik\r u},
     address = {Praha},
     year = {1923},
     pages = {114-133},
     url = {http://dml.mathdoc.fr/item/402693}
}