@article{700584,
     title = {On some problems concerning the convergence spaces and groups},
     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 = {[219]-229},
     mrnumber = {MR0278253},
     zbl = {0247.54003},
     url = {http://dml.mathdoc.fr/item/700584}
}

Novák, J. On some problems concerning the convergence spaces and groups, dans General Topology and Its Relations to Modern Analysis and Algebra, GDML_Books,  (1971), pp. [219]-229. http://gdmltest.u-ga.fr/item/700584/