@book{Nitsch2004,
author = {Nitsch, Volker},
year = {2004},
isbn = {3-935058-86-1},
language = {eng},
copyright = {http://www.fu-berlin.de/sites/refubium/rechtliches/Nutzungsbedingungen},
title = {Zipf zipped},
url = "http://dx.doi.org/10.17169/FUDOCS_document_000000000450",
}