?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=+Erd%C5%91s+Albin&rft.aulast=Erd%C5%91s&rft.aufirst=Albin&rft.btitle=Barcs+k%C3%B6zs%C3%A9g+f%C3%B6ldrajza&rft.date=1944&rft.genre=book