@article{1183742020, author = {John, Thomas}, title = {Recursion in Kolmogorov's $R$-Operator and the Ordinal $\sigma\_3$}, journal = {J. Symbolic Logic}, volume = {51}, number = {1}, year = {1986}, pages = { 1-11}, language = {en}, url = {http://dml.mathdoc.fr/item/1183742020} }
John, Thomas. Recursion in Kolmogorov's $R$-Operator and the Ordinal $\sigma_3$. J. Symbolic Logic, Tome 51 (1986) no. 1, pp. 1-11. http://gdmltest.u-ga.fr/item/1183742020/