THE CENTRAL SUBGROUPS OF THE NONABELIAN TENSOR SQUARES OF SOME BIEBERBACH GROUPS WITH ELEMENTARY ABELIAN 2-GROUP POINT GROUP. J. Teknol. [Internet]. 2017 Oct. 22 [cited 2025 Apr. 13];79(7). Available from: https://journals.utm.my/jurnalteknologi/article/view/10677