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@article{AMLG_1978__19_137950, author = {Robert A. Di Paola}, title = {The operator gap theorem in ...-recursion theory.}, journal = {Archiv f\"ur mathematische Logik und Grundlagenforschung}, pages = {115--130}, publisher = {mathdoc}, volume = {19}, year = {1978}, zbl = {0412.03031}, url = {http://geodesic.mathdoc.fr/item/AMLG_1978__19_137950/} }
Robert A. Di Paola. The operator gap theorem in ...-recursion theory.. Archiv für mathematische Logik und Grundlagenforschung, Tome 19 (1978), pp. 115-130. http://geodesic.mathdoc.fr/item/AMLG_1978__19_137950/