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@article{AM2_1980__20_182395, author = {Ronald P. Infante}, title = {Strong normality and normality for difference fields.}, journal = {Aequationes mathematicae}, pages = {159--165}, publisher = {mathdoc}, volume = {20}, year = {1980}, zbl = {0459.12018}, url = {http://geodesic.mathdoc.fr/item/AM2_1980__20_182395/} }
Ronald P. Infante. Strong normality and normality for difference fields.. Aequationes mathematicae, Tome 20 (1980), pp. 159-165. http://geodesic.mathdoc.fr/item/AM2_1980__20_182395/