An attempt at making a cave monastery in Kalach, Voronezh guberniya, in the late 19th — early 20th centuries - Vitalii Stepkin (Vestnik Pravoslavnogo Svâto-Tihonovskogo Gumanitarnogo Universiteta: Seriâ II. Istoriâ, Istoriâ Russkoj Pravoslavnoj Cerkvi, 2024)