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@article{MAN_1965__159_182693, author = {A. NERODE}, title = {Additive {Relations} among {Recursive} {Equivalence} {Types.}}, journal = {Mathematische Annalen}, pages = {329--343}, publisher = {mathdoc}, volume = {159}, year = {1965}, zbl = {0168.01102}, url = {http://geodesic.mathdoc.fr/item/MAN_1965__159_182693/} }
A. NERODE. Additive Relations among Recursive Equivalence Types.. Mathematische Annalen, Tome 159 (1965), pp. 329-343. http://geodesic.mathdoc.fr/item/MAN_1965__159_182693/