@book {Popkonstantinov1994,
	title = {Старобългарски надписи. Altbulgarische Inschriften. 1. Band},
	series = {Die Slawischen Sprachen},
	volume = {36},
	year = {1994},
	address = {Wien},
	author = {Popkonstantinov, Kazimir and Kronsteiner, Otto}
}
