@article{AMLG_1966__10_137795,
     author = {Peter H.G. Aczel},
     title = {Paths in {Kleene's} 0.},
     journal = {Archiv f\"ur mathematische Logik und Grundlagenforschung},
     pages = {8--12},
     publisher = {mathdoc},
     volume = {10},
     year = {1966},
     zbl = {0153.31602},
     url = {http://geodesic.mathdoc.fr/item/AMLG_1966__10_137795/}
}