Geodesic
On a~countable base and the conjugate class of a~topological space
Sbornik. Mathematics, Tome 29 (1976) no. 1, pp. 13-33

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In this paper the classes $\varphi (L)$ of functions are studied, and the topological spaces $U_\varphi$ are constructed from them. In particular, a necessary and sufficient condition guaranteeing a countable base in $U_\varphi$ is found. Classes $\overline\varphi (L)$ of functions conjugate (relative to sum) to $\varphi (L)$ are introduced and investigated. Bibliography: 7 titles. 
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     title = {On a~countable base and the conjugate class of a~topological space},
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P. L. Ul'yanov. On a~countable base and the conjugate class of a~topological space. Sbornik. Mathematics, Tome 29 (1976) no. 1, pp. 13-33. http://geodesic.mathdoc.fr/item/SM_1976_29_1_a2/