%0 Journal Article %A R. Narasimhan %A K. Chandrasekharan %T An Approximate Reciprocity Formula for Some Exponential Sums. %J Commentarii mathematici Helvetici %D 1968 %P 296-310 %V 43 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMH_1968__43_139369/ %F CMH_1968__43_139369