@inbook{403914,
     title = {Rejst\v r\'\i k pou\v zit\'ych symbol\r u},
     booktitle = {Rovinn\'e grafy},
     series = {GDML\_Books},
     publisher = {Mlad\'a fronta},
     address = {Praha},
     year = {1977},
     pages = {130-130},
     url = {http://dml.mathdoc.fr/item/403914}
}