@article{1077379121, author = {Olin, Philip}, title = {Elementary extensions within reduced powers}, journal = {Duke Math. J.}, volume = {37}, number = {1}, year = {1970}, pages = { 421-429}, language = {en}, url = {http://dml.mathdoc.fr/item/1077379121} }
Olin, Philip. Elementary extensions within reduced powers. Duke Math. J., Tome 37 (1970) no. 1, pp. 421-429. http://gdmltest.u-ga.fr/item/1077379121/