@article{1183534968, author = {Makkai, M.}, title = {Global definability theory in $L\_{\omega \_1 \omega }$}, journal = {Bull. Amer. Math. Soc.}, volume = {79}, number = {5}, year = {1973}, pages = { 916-921}, language = {en}, url = {http://dml.mathdoc.fr/item/1183534968} }
Makkai, M. Global definability theory in $L_{\omega _1 \omega }$. Bull. Amer. Math. Soc., Tome 79 (1973) no. 5, pp. 916-921. http://gdmltest.u-ga.fr/item/1183534968/