Tarmizi, R. A. and Sulaiman, H. (2021) “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, pp. 18–27. doi: 10.37134/jsml.vol9.sp.3.2021.