@article{CTGDC_1983__24_2_215_0, author = {Hien, Bui Huy and Sain, I.}, title = {In which categories are first-order axiomatizable hulls characterizable by ultraproducts ?}, journal = {Cahiers de Topologie et G\'eom\'etrie Diff\'erentielle Cat\'egoriques}, volume = {24}, year = {1983}, pages = {215-222}, mrnumber = {710042}, zbl = {0519.18003}, language = {en}, url = {http://dml.mathdoc.fr/item/CTGDC_1983__24_2_215_0} }
Hien, Bui Huy; Sain, I. In which categories are first-order axiomatizable hulls characterizable by ultraproducts ?. Cahiers de Topologie et Géométrie Différentielle Catégoriques, Tome 24 (1983) pp. 215-222. http://gdmltest.u-ga.fr/item/CTGDC_1983__24_2_215_0/
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