P. V. Danchev and P. Keef, “On properties of n-totally projective abelian p -groups”, Ukr. Mat. Zhurn., vol. 64, no. 6, pp. 766–771, Jun. 2012, Accessed: Feb. 16, 2026. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/2615