Tarmizi, Rawdah Adawiyah, and Hajar Sulaiman. “Characterisation of 5-Groups Having a X11-Covering With Core-Free Intersection: Pencirian Kumpulan-5 Yang Mempunyai Litupan-X11 Dengan Persilangan Bebas-Teras”. Journal of Science and Mathematics Letters 9 (February 18, 2021): 18–27. Accessed November 21, 2024. https://ejournal.upsi.edu.my/index.php/JSML/article/view/4804.