Petrenko, O. V. and Protasov, I. V. (2012) “Balleans and <i>G</i&gt; -spaces”, Ukrains’kyi Matematychnyi Zhurnal, 64(3), pp. 344-350. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/2580 (Accessed: 29March2024).