Doneva, Blagica, Iva Tomova, Gjorgi Dimov, and Marjan Delipetrev. “GEOPHYSICAL AND GEOTECHNICAL EXPLORATIONS ON THE FORTRESS ISAR – ŠTIP”. Geologica Macedonica 33, no. 2 (December 11, 2019): 147-158. Accessed April 24, 2024. https://js.ugd.edu.mk/index.php/GEOLMAC/article/view/3328.