@article{1183744177, author = {Judah, Haim and Shelah, Saharon}, title = {$\triangle^1\_3$-Sets of Reals}, journal = {J. Symbolic Logic}, volume = {58}, number = {1}, year = {1993}, pages = { 72-80}, language = {en}, url = {http://dml.mathdoc.fr/item/1183744177} }
Judah, Haim; Shelah, Saharon. $\triangle^1_3$-Sets of Reals. J. Symbolic Logic, Tome 58 (1993) no. 1, pp. 72-80. http://gdmltest.u-ga.fr/item/1183744177/