@article{MZ_1964__86_170354,
     author = {A. Nerode},
     title = {Non-linear combinatorial functions of isols.},
     journal = {Mathematische Zeitschrift},
     pages = {410--424},
     publisher = {mathdoc},
     volume = {86},
     year = {1964},
     zbl = {0158.25103},
     url = {http://geodesic.mathdoc.fr/item/MZ_1964__86_170354/}
}