@article{MASLO_1994__44_1_a3,
     author = {Jasem, Milan},
     title = {Weak isometries in directed groups},
     journal = {Mathematica slovaca},
     pages = {39--43},
     publisher = {mathdoc},
     volume = {44},
     number = {1},
     year = {1994},
     mrnumber = {1290271},
     zbl = {0797.06016},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MASLO_1994__44_1_a3/}
}