Nyagahakwa, Venuste, and Gratien Haguma. “Non-Lebesgue Measurability of Finite Unions of Vitali Selectors Related to Different Groups”. MATHEMATICA SCANDINAVICA 127, no. 3 (November 30, 2021). Accessed January 22, 2022. https://www.mscand.dk/article/view/128969.