Dimanova , Donika. “HISTORICAL DEVELOPMENT OF STRUCTURES FOR THE PROTECTION OF POPULATION: HISTORICAL DEVELOPMENT OF STRUCTURES FOR THE PROTECTION OF POPULATION”. JOURNAL SCIENTIFIC AND APPLIED RESEARCH 9, no. 1 (March 18, 2023): 99–106. Accessed November 25, 2024. https://jsar.ftn.shu.bg/ojs-3.3.0-7/index.php/jsar/article/view/196.