Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MOMA_1968__72_177433, author = {Alfred L. Foster}, title = {Pre-fields and {Universal} {Algebraic} {Extensions;} {Equational} {Precessions.}}, journal = {Monatshefte f\"ur Mathematik}, pages = {315--324}, publisher = {mathdoc}, volume = {72}, year = {1968}, zbl = {0162.32503}, url = {http://geodesic.mathdoc.fr/item/MOMA_1968__72_177433/} }
Alfred L. Foster. Pre-fields and Universal Algebraic Extensions; Equational Precessions.. Monatshefte für Mathematik, Tome 72 (1968), pp. 315-324. http://geodesic.mathdoc.fr/item/MOMA_1968__72_177433/