I. V. Protasov, “Two theorems on imbeddings of 0-dimensional groups”, Ukr. Mat. Zhurn., vol. 46, no. 11, pp. 1594–1596, Nov. 1994, Accessed: Apr. 13, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/5603