@inbook {Popkonstantinov1999,
	title = {The Letter of Abgar on a Tenth-Century Amulet},
	booktitle = {Ars Philologica. Festschrift f{\"u}r Baldur Panzer zu 65. Geburtstag. Herausgegeben von Karsten Gr{\"u}nberg und Wilfired Potthoff},
	year = {1999},
	pages = {649-65},
	publisher = {Peter Lang},
	organization = {Peter Lang},
	address = {Frankfurt am Main et. al.},
	author = {Popkonstantinov, Kazimir}
}
@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}
}
@article {Popkonstantinov1986,
	title = {Die Inschriften des Felsklosters Murfatlar},
	journal = {Die Slawischen Sprachen},
	volume = {10},
	year = {1986},
	pages = {77-106},
	author = {Popkonstantinov, Kazimir}
}
