@article{MABA_1992_6_2_a3,
     author = {Aleksandar Jovanovich},
     title = {A {Note} on {Ultrafilter} {Selectivity}},
     journal = {Mathematica balkanica},
     pages = {129},
     publisher = {mathdoc},
     volume = {6},
     number = {2},
     year = {1992},
     url = {http://geodesic.mathdoc.fr/item/MABA_1992_6_2_a3/}
}