@misc{AMUC_1980__37_185789,
     title = {[unknown]},
     journal = {Acta mathematica Universitatis Comenianae},
     pages = {147--156},
     publisher = {mathdoc},
     volume = {37},
     year = {1980},
     url = {http://geodesic.mathdoc.fr/item/AMUC_1980__37_185789/}
}