%0 Journal Article %A A. Nerode %T Combinatorial series and recursive equivalence types %J Fundamenta Mathematicae %D 1966 %P 113-141 %V 58 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-58-2-113-141/ %R 10.4064/fm-58-2-113-141 %G en %F 10_4064_fm_58_2_113_141