@article {Thomson1987,
	title = {The Problem of the Reception of the Works of John {IV} Ieiunator of Constantinople among the Slavs: Nicon of the Black Mount and Cirycus of Novgorod},
	journal = {Palaeobulgarica / Старобългаристика},
	volume = {11},
	year = {1987},
	pages = {23{\textendash}45},
	author = {Thomson, Francis J.}
}
