Ajiev, S.S. 2014. “Hölder Analysis and Geometry on Banach Spaces: Homogeneous Homeomorphisms and Commutative Group Structures, Approximation and Tsar’kov’s Phenomenon Part II”. Eurasian Mathematical Journal 5 (2):7-51. https://emj.enu.kz/index.php/main/article/view/569.