@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},
     publisher = {mathdoc},
     volume = {06},
     number = {4},
     year = {1965},
     mrnumber = {0194544},
     zbl = {0136.00802},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1965__6_4_a3/}
}