GuptaS. and HolubowskiW. (2002) “On 2-Symmetric Words in Nilpotent Groups”, Ukrains’kyi Matematychnyi Zhurnal, 54(7), pp. 1020-1024. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/4142 (Accessed: 22November2024).