(1)
Stamboliyska, B.; Belishki, S.; Haralampiev, N.; Yancheva, D.; Velcheva, E.; Penkova, P.; Lederer, A.; Fischer, D. The Wall Paintings in the Russian Church St. Nicholas in Sofia: A Technological Study by Integrated Analytical Approach. C. R. Acad. Bulg. Sci. 2023, 76, 377-387.