@book{id_51,
author = "Gardner, Johann von and Koschmieder, Erwin",
title = "Ein handschriftliches Lehrbuch der altrussischen Neumenschrift",
year = "1963",
address = "München",
publisher = "Beck",
series = "Abhandlungen",
volume = "57; 1",
url = "http://publikationen.badw.de/de/003835082",
}