Alzubaidy, Kahtan H. “Cohomology of Finite Abelian $p$-Groups and Free Actions”. Tamkang Journal of Mathematics 41, no. 3 (September 30, 2010): 271–273. Accessed April 29, 2024. https://journals.math.tku.edu.tw/index.php/TKJM/article/view/725.