@article{CMUC_1967_8_2_a1,
     author = {Havel, V\'aclav},
     title = {Coordinatization of parallel systems. {II}},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {199--208},
     year = {1967},
     volume = {8},
     number = {2},
     mrnumber = {0217682},
     zbl = {0161.40202},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1967_8_2_a1/}
}