Robert A. DiPaola. Pseudo-complements and ordinal logics based on consistency statements. The journal of symbolic logic, vol. 31 (1966), pp. 359–364. - Robert A. Dipaola. Some properties of pseudo-complements of recursively enumerable sets. Transactions of the American Mathematical Society, vol. 121 (1966), pp. 296–308.
1972 ◽
Vol 37
(2)
◽
pp. 406-406