@incollection{,
address  = {},
author = {Horgan, John C.},
booktitle = {Encyclopedia of the Vatican and papacy},
keywords = {8. Jahrhundert},
pages = {116-117},
title={Art. Constantine (708-715)},
uniqueid = {845789},
url = {http://opac.regesta-imperii.de/id/845789},
year = {1999}
}