@article{1183738959,
author = {Jones, Neil D. and Selman, Alan L.},
title = {Turing Machines and the Spectra of First-Order Formulas},
journal = {J. Symbolic Logic},
volume = {39},
number = {1},
year = {1974},
pages = { 139-150},
language = {en},
url = {http://dml.mathdoc.fr/item/1183738959}
}
Jones, Neil D.; Selman, Alan L. Turing Machines and the Spectra of First-Order Formulas. J. Symbolic Logic, Tome 39 (1974) no. 1, pp. 139-150. http://gdmltest.u-ga.fr/item/1183738959/