@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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