Maheshwari , S., and R. K. Sharma. “A Note on Units in $\mathbb{F}_q SL(2, \mathbb{Z}_3)$”. Ukrains’kyi Matematychnyi Zhurnal, vol. 73, no. 8, Aug. 2021, pp. 1147-52, https://umj.imath.kiev.ua/index.php/umj/article/view/588.