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 | 1967 | |
|---|---|---|
| 2 |      | Julia Robinson: An Introduction to Hyperarithmetical Functions. J. Symb. Log. 32(3): 325-342 (1967) |
| 1949 | ||
| 1 | | Julia Robinson: Definability and Decision Problems in Arithmetic. J. Symb. Log. 14(2): 98-114 (1949) |