Team, S. “E-Torsion Free Acts Over Monoids: Akbar Golchin, Abbas Zare, Hossein Mohammadzadeh”. Thai Journal of Mathematics, vol. 14, no. 1, Apr. 2016, pp. 93-114, https://thaijmath2.in.cmu.ac.th/index.php/thaijmath/article/view/584.