Position of the Russian Church outside Russia as to the issue of holiness of Moscow Patriarchate in the period of metropolitan Filaret (Voznesensky) - Andrey Kostryukov (Vestnik Pravoslavnogo Svâto-Tihonovskogo Gumanitarnogo Universiteta: Seriâ II. Istoriâ, Istoriâ Russkoj Pravoslavnoj Cerkvi, 2021)