Bondarev, Sergey A. “Inclusion of Hajłasz – Sobolev class Mpα(X) Into  the space of continuous functions in the critical case”. Journal of the Belarusian State University. Mathematics and Informatics, no. 1, Mar. 2020, pp. 6-12, https://doi.org/10.33581/2520-6508-2020-1-6-12.