@article{106042, author = {Petr A. Biryukov}, title = {Cardinalities and ranks of $\pi$-bases in topological spaces}, journal = {Commentationes Mathematicae Universitatis Carolinae}, volume = {021}, year = {1980}, pages = {769-776}, zbl = {0457.54003}, mrnumber = {597766}, language = {en}, url = {http://dml.mathdoc.fr/item/106042} }
Biryukov, Petr A. Cardinalities and ranks of $\pi$-bases in topological spaces. Commentationes Mathematicae Universitatis Carolinae, Tome 021 (1980) pp. 769-776. http://gdmltest.u-ga.fr/item/106042/
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