@book{id_12266,
author = "Helbig, Wolfgang",
title = "Zur Geschichte des römischen Equitatus",
year = "1905",
address = "München",
publisher = "Akad. der Wiss.",
series = "Abhandlungen",
volume = "23,[3] : 2. Abt.",
url = "http://publikationen.badw.de/de/003835339",
}