@article{02125647,
title = {Algebraically closed and existentially closed substructures in categorical context.},
journal = {Theory and Applications of Categories [electronic only]},
volume = {12},
year = {2004},
pages = {269-298},
zbl = {1087.18001},
language = {en},
url = {http://dml.mathdoc.fr/item/02125647}
}
Hebert, Michel. Algebraically closed and existentially closed substructures in categorical context.. Theory and Applications of Categories [electronic only], Tome 12 (2004) pp. 269-298. http://gdmltest.u-ga.fr/item/02125647/