Brondon N. Vouofo Gapgueu, et al. “Epidemiological Aspects of the Use of Modern Contraceptive Methods in Urban and Rural Settings of Burundi”. International Journal of Formal Sciences: Current and Future Research Trends, vol. 15, no. 1, Oct. 2022, pp. 57-70, https://ijfscfrtjournal.isrra.org/Formal_Sciences_Journal/article/view/697.