@article{CMUC_1965_6_4_a3,
     author = {Havel, V\'aclav},
     title = {Construction of certain systems with two compositions},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {413--428},
     year = {1965},
     volume = {6},
     number = {4},
     mrnumber = {0194544},
     zbl = {0136.00802},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1965_6_4_a3/}
}