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@article{10_4064_fm_121_3_239_250, author = {Kenneth Schilling}, title = {On absolutely $\ensuremath{\Delta}^1_2$ operations}, journal = {Fundamenta Mathematicae}, pages = {239--250}, publisher = {mathdoc}, volume = {121}, number = {3}, year = {1984}, doi = {10.4064/fm-121-3-239-250}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-121-3-239-250/} }
Kenneth Schilling. On absolutely $Δ^1_2$ operations. Fundamenta Mathematicae, Tome 121 (1984) no. 3, pp. 239-250. doi : 10.4064/fm-121-3-239-250. http://geodesic.mathdoc.fr/articles/10.4064/fm-121-3-239-250/
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