ZEHRAOUI, SABIHA. “CRISIS MANAGEMENT: CASE STUDY OF NYIRAGONGO VOLCANO ERUPTION 2021 IN DEMOCRATIC REPUBLIC OF CONGO”. Digital Repository of Theses - SSBM Geneva (September 15, 2023). Accessed October 9, 2025. https://repository.e-ssbm.com/index.php/rps/article/view/216.