Ndayirukiye, A., Ndikuryayo, F., Mpawenayo, P. C., Ngezahayo, J., & Gahungu, G. (2026). Theophylline and Caffeine Content in Black Tea Produced in Burundi. European Scientific Journal, ESJ, 49, 600. Retrieved from https://eujournal.org/index.php/esj/article/view/20572