Levshenko, B.; Smirnov, J. M.: Об одном свойстве нульмерных метрическх ространств.
(Russian) [On a property of zerodimensional metric spaces].
In:
General Topology and its Relations to Modern Analysis and Algebra.
Proceedings of the second Prague topological symposium, 1966.
Academia Publishing House of the Czechoslovak Academy of Sciences, Praha, 1967.
pp. 241-242
Smirnov, J. M.:
Proximitní prostory.
(Czech) [On proximity spaces].Pokroky matematiky, fyziky a astronomie,
vol. 1
(1956),
issue 1,
pp. 14-23