Partov, Doncho N.; Christo T. Christov; Vesselin K. Kantchev; Dobromir E. Dinev; Aleksander K. Taushanov; Edelvais E. Popova; Deian P. Mitev. „State of Art of Historic Structures in Bulgaria”(PDF). ARCCHIP Advanced Research Centre for Cultural Heritage Interdisciplinary Projects. p. 4. Arhivat din original(PDF) la . Accesat în .
Partov, Doncho N.; Christo T. Christov; Vesselin K. Kantchev; Dobromir E. Dinev; Aleksander K. Taushanov; Edelvais E. Popova; Deian P. Mitev. „State of Art of Historic Structures in Bulgaria”(PDF). ARCCHIP Advanced Research Centre for Cultural Heritage Interdisciplinary Projects. p. 4. Arhivat din original(PDF) la . Accesat în .