Sevost’yanov, E. A., S. O. Skvortsov, and E. A. Petrov. “On Equicontinuous Families of Mappings of Metric Spaces”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 72, no. 10, Oct. 2020, pp. 1418 -31, doi:10.37863/umzh.v72i10.1075.