Luchev, Detelin, Desislava Paneva-Marinova, Radoslav Pavlov, Lilia Pavlova, Zsolt László Márkus, Gábor Kaposi, Tibor Szkaliczki, and Miklós Veres. “Presenting Bulgarian Cultural and Historical Sites With Panorama Pictures”. Digital Presentation and Preservation of Cultural and Scientific Heritage 7 (September 10, 2017): 113–122. Accessed April 20, 2024. https://dipp.math.bas.bg/dipp/article/view/dipp.2017.7.10.