Masri, Rohaidah, Tan Yee Ting, and Nor’ashiqin Mohd. Idrus. 2016. “Generalization of the Central Subgroup of the Nonabelian Tensor Square of a Crystallographic Group With Symmetric Point Group”. Journal of Informatics and Mathematical Sciences 8 (4):253-57. https://doi.org/10.26713/jims.v8i4.556.