@incollection{,
address  = {},
author = {Sveinsson, Einar Ólafur},
booktitle = {The Viking Congress 3},
keywords = {},
pages = {74-76},
title={Þingvellir - the place and its history},
uniqueid = {3042467},
url = {http://opac.regesta-imperii.de/id/3042467},
year = {1958}
}