@Book{067546641,
author="Vogel, Walther",
title="Nordische Seefahrten im fr{\"u}heren Mittelalter",
series="Meereskunde 1,7",
year="1907",
publisher="Mittler",
address="Berlin",
note="von W. Vogel",
note="[Umschlagt.]",
language="German"
}