@article{1183746366, author = {Solomon, Reed}, title = {$\Pi^1\_1 - CA\_0$ and Order Types of Countable Ordered Groups}, journal = {J. Symbolic Logic}, volume = {66}, number = {1}, year = {2001}, pages = { 192-206}, language = {en}, url = {http://dml.mathdoc.fr/item/1183746366} }
Solomon, Reed. $\Pi^1_1 - CA_0$ and Order Types of Countable Ordered Groups. J. Symbolic Logic, Tome 66 (2001) no. 1, pp. 192-206. http://gdmltest.u-ga.fr/item/1183746366/