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@article{AL_1985_24_6_a5, author = {C. J. Ash and S. S. Goncharov}, title = {Strong $\Delta^0_2$ categoricity}, journal = {Algebra i logika}, pages = {718--727}, publisher = {mathdoc}, volume = {24}, number = {6}, year = {1985}, language = {en}, url = {http://geodesic.mathdoc.fr/item/AL_1985_24_6_a5/} }
C. J. Ash; S. S. Goncharov. Strong $\Delta^0_2$ categoricity. Algebra i logika, Tome 24 (1985) no. 6, pp. 718-727. http://geodesic.mathdoc.fr/item/AL_1985_24_6_a5/