@article{CMH_1968__43_139349,
     author = {R. Narasimhan and K. Chandrasekharan},
     title = {Zeta-Functions of {Ideal} {Classes} in {Quadratic} {Fields} and their {Zeros} on the {Critical} {Line.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {18--30},
     publisher = {mathdoc},
     volume = {43},
     year = {1968},
     zbl = {0157.09302},
     url = {http://geodesic.mathdoc.fr/item/CMH_1968__43_139349/}
}