Abdollahi, A. (2009). Groups with maximal irredundant covers and minimal blocking sets. arXiv preprint arXiv.0901.1793.
Abdollahi, A., Ataei, J., & Hassanabadi, M. (2005). Groups with a maximal irredundant 6-cover. Communications in Algebra, 33(9), 3225–3238.
Abdollahi, A., Ataei, J., & Hassanabadi, M. (2008). Minimal blocking sets in PG(n,2) and covering groups by subgroups. Communications in Algebra, 36(2), 365–380.
Abdollahi, A., & Jafarian, A. S. (2008). On groups with an irredundant 7-cover. Journal of pure and applied algebra, 209(2), 291–300.
Ataei, M. J. (2010). C8-groups and nilpotency condition. International Journal of Algebra, 4(22), 1057–1062.
Ataei, M. J., & Sajjad, V. (2011). Characterization of 5-groups with a maximal irredundant 10-cover. International Mathematical Forum, 35(6), 1733–1738.
Bryce, R. A., Fedri, V., & Serena, L. (1997). Covering groups with subgroups. Bulletin of the Australian Mathematical Society, 55(3), 469–476.
Greco, D. (1953). Su alcunigruppifinitichesonosomma di cinquesottogruppi. Rend. Sem. Mat. Univ. Padova: 22, 313–333.
Hungerford, T. W. (1974). Algebra. New York, NY: Springer.
Newton, B. (2011). On the number of maximal subgroups of a finite solvable group. Archiv der Mathematik, 96(6): 501–506.
Tarmizi, R. A., & Sulaiman, H. (2016). Characterization of 7-Groups with a C12-Covering. Journal of Informatics and Mathematical Sciences, 8(4), 267-272.
Abd Manaf, F. N., Sarmin, N. H., Mohd Ali, N. M., & Erfanian, A. (2019). On The Exterior Degree of Some Finite p-Groups. Journal of Science and Mathematics Letters, 4(2), 69-74. Retrieved from https://ejournal.upsi.edu.my/index.php/JSML/article/view/394