@article{MABA_2010_24_3-4_a7,
     author = {N. Memic},
     title = {Multiplicative {Systems} on {Ultra-Metric} {Spaces}},
     journal = {Mathematica balkanica},
     pages = {275},
     publisher = {mathdoc},
     volume = {24},
     number = {3-4},
     year = {2010},
     url = {http://geodesic.mathdoc.fr/item/MABA_2010_24_3-4_a7/}
}