Ndayirukiye, Alice, Ferdinand Ndikuryayo, Pierre Claver Mpawenayo, Jeremie Ngezahayo, and Godefroid Gahungu. 2026. “Theophylline and Caffeine Content in Black Tea Produced in Burundi”. European Scientific Journal, ESJ 49 (January), 600. https://eujournal.org/index.php/esj/article/view/20572.