@article{1093635328,
author = {Shelah, Saharon and Steinhorn, Charles},
title = {The nonaxiomatizability of $L(Q^2\_{\aleph\_1})$ by finitely many schemata.},
journal = {Notre Dame J. Formal Logic},
volume = {30},
number = {2},
year = {1989},
pages = { 1-13},
language = {en},
url = {http://dml.mathdoc.fr/item/1093635328}
}
Shelah, Saharon; Steinhorn, Charles. The nonaxiomatizability of $L(Q^2_{\aleph_1})$ by finitely many schemata.. Notre Dame J. Formal Logic, Tome 30 (1989) no. 2, pp. 1-13. http://gdmltest.u-ga.fr/item/1093635328/