[1]
S. Gupta and W. Holubowski, “On 2-Symmetric Words in Nilpotent Groups”,
Ukr. Mat. Zhurn.
, vol. 54, no. 7, pp. 1020–1024, Jul. 2002, Accessed: Apr. 07, 2025. [Online]. Available:
https://umj.imath.kiev.ua/index.php/umj/article/view/4142