@article{CM_1962-1964__15__156_0,
     author = {Van Rootselaar, B.},
     title = {Algebraische {Kennzeichnung} freier {Wortarithmetiken}},
     journal = {Compositio Mathematica},
     pages = {156--168},
     publisher = {Kraus Reprint},
     volume = {15},
     year = {1962-1964},
     mrnumber = {168459},
     zbl = {0117.01402},
     language = {de},
     url = {http://www.numdam.org/item/CM_1962-1964__15__156_0/}
}