@article{ARM_1989__25_1-2_a9,
     author = {Kolibiar, Milan},
     title = {Median groups},
     journal = {Archivum mathematicum},
     pages = {73--82},
     publisher = {mathdoc},
     volume = {25},
     number = {1-2},
     year = {1989},
     mrnumber = {1189201},
     zbl = {0713.20033},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_1989__25_1-2_a9/}
}