Hy. Chen et Wt. Tong, THE STRUCTURE OF MODULES, Science in China. Series A, Mathematics, Physics, Astronomy & Technological Sciences, 37(6), 1994, pp. 683-692
In this paper, we introduce two concepts: projective radical and semi-
reflexive radical of a module, and establish some elementary relations
among subprojective semi-reflexive and torsion-free modules. Using th
ese properties, we give classifications of some rings.