М. Бакурадзе. “Some Explicit Expressions Concerning the Nadiradze Formal Group Law”. BULLETIN OF THE L.N. GUMILYOV EURASIAN NATIONAL UNIVERSITY. Mathematics. Computer Science. Mechanics Series, vol. 126, no. 1, Jan. 2019, pp. 62-67, https://bulmathmc.enu.kz/index.php/main/article/view/40.