Kapica, Roman, Dana Vrublová, and Markéta Michalusová. “Photogrammetric Documentation of Czechoslovak Border Fortifications at Hlučín-Darkovičky”. Geodesy and Cartography 39, no. 2 (June 28, 2013): 72-79. Accessed April 26, 2024. https://journals.vilniustech.lt/index.php/GAC/article/view/4065.