Гарбуль, Людмила Павловна Павловна. “On the Question of Inter-Slavonic Language Contacts in the 15–17th Centuries (on the Material of the Diplomatic Correspondence of Muscovy)”. Slavistica Vilnensis, vol. 63, Oct. 2018, pp. 197-14, https://doi.org/10.15388/SlavViln.2018.63.11850.