@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/