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@article{10_4064_fm_127_1_67_76, author = {J. Paris and A. Wilkie}, title = {Counting $\ensuremath{\Delta}_0$ sets}, journal = {Fundamenta Mathematicae}, pages = {67--76}, publisher = {mathdoc}, volume = {127}, number = {1}, year = {1987}, doi = {10.4064/fm-127-1-67-76}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-127-1-67-76/} }
J. Paris; A. Wilkie. Counting $Δ_0$ sets. Fundamenta Mathematicae, Tome 127 (1987) no. 1, pp. 67-76. doi : 10.4064/fm-127-1-67-76. http://geodesic.mathdoc.fr/articles/10.4064/fm-127-1-67-76/
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