Lin, Fucai, Chuan Liu, and Li-Hong Xie. “Remainders of Semitopological Groups or Paratopological Groups”. Ukrains’kyi Matematychnyi Zhurnal 66, no. 4 (April 25, 2014): 500–509. Accessed March 29, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/2152.