@article{1183742914,
author = {Sigal, Ron},
title = {Undecidable Complexity Statements in $E^\alpha\_\mathbf{S}$-Arithmetic},
journal = {J. Symbolic Logic},
volume = {54},
number = {1},
year = {1989},
pages = { 415-427},
language = {en},
url = {http://dml.mathdoc.fr/item/1183742914}
}
Sigal, Ron. Undecidable Complexity Statements in $E^\alpha_\mathbf{S}$-Arithmetic. J. Symbolic Logic, Tome 54 (1989) no. 1, pp. 415-427. http://gdmltest.u-ga.fr/item/1183742914/