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@article{MZ_1976__152_172457, author = {Manohar L. Madan}, title = {Null {Class} {Groups} of {Algebraic} {Function} {Fields.}}, journal = {Mathematische Zeitschrift}, pages = {59--66}, publisher = {mathdoc}, volume = {152}, year = {1976}, zbl = {0324.14004}, url = {http://geodesic.mathdoc.fr/item/MZ_1976__152_172457/} }
Manohar L. Madan. Null Class Groups of Algebraic Function Fields.. Mathematische Zeitschrift, Tome 152 (1976), pp. 59-66. http://geodesic.mathdoc.fr/item/MZ_1976__152_172457/