Bilyak, Y.T, and M.Ya Komarnitskii. “On Elementarity of Radical Classes of Modules over Noncommutative Dedekind Duo-Domains”. Carpathian Mathematical Publications, vol. 4, no. 2, Dec. 2012, pp. 197-03, https://vps.pnu.edu.ua/index.php/cmp/article/view/2148.