The photogrammetric model was created for the needs of *The Conservation Study of architectural heritage in the Municipality of Surdulica* done by the Institute for the Cultural Heritage Preservation Niš under the leadership of architect Ivana Cvetković and historian Đorđe Stošić.
Photogrammetric model is made by the architect Aleksandar Nikšić; https://sketchfab.com/nixic.alexandar
https://goo.gl/maps/GZfM9LRyJ8a1w5mu5