Geodesic
Cardinalities and ranks of $\pi$-bases in topological spaces
Commentationes Mathematicae Universitatis Carolinae, Tome 21 (1980) no. 4, pp. 769-776.

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Classification : 03E35, 54A25, 54A35, 54G10 
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     title = {Cardinalities and ranks of $\pi$-bases in topological spaces},
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Biryukov, Petr A. Cardinalities and ranks of $\pi$-bases in topological spaces. Commentationes Mathematicae Universitatis Carolinae, Tome 21 (1980) no. 4, pp. 769-776. http://geodesic.mathdoc.fr/item/CMUC_1980__21_4_a12/