@article{700561,
title = {New cardinal invariants for topological spaces},
booktitle = {General Topology and Its Relations to Modern Analysis and Algebra},
series = {GDML\_Books},
publisher = {Academia Publishing House of the Czechoslovak Academy of Sciences},
address = {Praha},
year = {1971},
pages = {[201]-206},
mrnumber = {MR0331329},
zbl = {0229.54007},
url = {http://dml.mathdoc.fr/item/700561}
}
Meyer, P. R. New cardinal invariants for topological spaces, dans General Topology and Its Relations to Modern Analysis and Algebra, GDML_Books, (1971), pp. [201]-206. http://gdmltest.u-ga.fr/item/700561/