@article{1096901770, author = {Arai, Toshiyasu}, title = {Wellfoundedness proofs by means of non-monotonic inductive definitions I: $\Pi$ <sup>0</sup><sub>2</sub>-operators}, journal = {J. Symbolic Logic}, volume = {69}, number = {1}, year = {2004}, pages = { 830-850}, language = {en}, url = {http://dml.mathdoc.fr/item/1096901770} }
Arai, Toshiyasu. Wellfoundedness proofs by means of non-monotonic inductive definitions I: Π 02-operators. J. Symbolic Logic, Tome 69 (2004) no. 1, pp. 830-850. http://gdmltest.u-ga.fr/item/1096901770/