Sahoo, Tapatee, Bijan Davvaz, Harikrishnan Panackal, Babushri Srinivas Kedukodi, and Syam Prasad Kuncham. “Relative Essential Ideals in $N$-Groups”. Tamkang Journal of Mathematics 54, no. 1 (February 1, 2023): 69–82. Accessed March 25, 2023. https://journals.math.tku.edu.tw/index.php/TKJM/article/view/4136.