@article{1183740058, author = {Schlipf, John Stewart}, title = {Ordinal Spectra of First-Order Theories}, journal = {J. Symbolic Logic}, volume = {42}, number = {1}, year = {1977}, pages = { 492-505}, language = {en}, url = {http://dml.mathdoc.fr/item/1183740058} }
Schlipf, John Stewart. Ordinal Spectra of First-Order Theories. J. Symbolic Logic, Tome 42 (1977) no. 1, pp. 492-505. http://gdmltest.u-ga.fr/item/1183740058/