@article{AMLG_1962__6_137766,
     author = {J. Richard B\"uchi},
     title = {Regular {Canonical} {Systems.}},
     journal = {Archiv f\"ur mathematische Logik und Grundlagenforschung},
     pages = {91--111},
     year = {1962},
     volume = {6},
     zbl = {0129.26102},
     url = {http://geodesic.mathdoc.fr/item/AMLG_1962__6_137766/}
}