@article{AMLG_1983__23_138003,
     author = {R. Statman},
     title = {...-definable functionals and ... {Conversion.}},
     journal = {Archiv f\"ur mathematische Logik und Grundlagenforschung},
     pages = {21--26},
     publisher = {mathdoc},
     volume = {23},
     year = {1983},
     zbl = {0537.03009},
     url = {http://geodesic.mathdoc.fr/item/AMLG_1983__23_138003/}
}