Sapa, J., M. Zygmunt, Łukasz Krawczyk, M. Bednarski, J. Knutelska, M. Dudek, L. Nowiński, G. Chłoń-Rzepa, and M. Pawłowski. “Antiarrhythmic and Hypotensive Activity of New Analogues of Theophylline”. Medicina Internacia Revuo - International Medicine Review, no. 100, June 2013, pp. 129-36, https://interrev.com/mir/index.php/mir/article/view/96.