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@article{10_4064_fm_81_3_183_192, author = {Harvey Friedman}, title = {Minimality in the ${\ensuremath{\Delta}^1}_2$-degrees}, journal = {Fundamenta Mathematicae}, pages = {183--192}, publisher = {mathdoc}, volume = {81}, number = {3}, year = {1973}, doi = {10.4064/fm-81-3-183-192}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-81-3-183-192/} }
Harvey Friedman. Minimality in the ${Δ^1}_2$-degrees. Fundamenta Mathematicae, Tome 81 (1973) no. 3, pp. 183-192. doi : 10.4064/fm-81-3-183-192. http://geodesic.mathdoc.fr/articles/10.4064/fm-81-3-183-192/
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