Materials and Techniques of the Mural Paintings in the Church-Ossuary of the Rila Monastery, Bulgaria. - Stamboliyska, Bistra; Tapanov, Stefan; Velcheva, Evelina; Atanasova-Vladimirova, Stela; Ranguelov, Bogdan; Guncheva, Maya; Stoyanov, Simeon; Yancheva, Denitsa (Minerals (2075-163X), 2024)