John, M. N., S. I. Okeke, B. O. Nwala, and U. O. G. “Para-G Relations and Hirsch Length in Residually Nilpotent Groups”. IJO - International Journal of Mathematics (ISSN: 2992-4421 ), Vol. 7, no. 01, Jan. 2024, pp. 01-16, https://ijojournals.com/index.php/m/article/view/782.