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@article{CMH_1979__54_139801, author = {R. Narasimhan and K. Chandrasekharan}, title = {Exponential sums associated with algebraic number fields.}, journal = {Commentarii mathematici Helvetici}, pages = {523--561}, publisher = {mathdoc}, volume = {54}, year = {1979}, zbl = {0443.10027}, url = {http://geodesic.mathdoc.fr/item/CMH_1979__54_139801/} }
R. Narasimhan; K. Chandrasekharan. Exponential sums associated with algebraic number fields.. Commentarii mathematici Helvetici, Tome 54 (1979), pp. 523-561. http://geodesic.mathdoc.fr/item/CMH_1979__54_139801/