@article{MM2_1995__88_1_156134,
     author = {Hans-Georg R\"uck},
     title = {Theta {Series} of {Imaginary} {Quadratic} {Function} {Fields.}},
     journal = {Manuscripta mathematica},
     pages = {387--408},
     publisher = {mathdoc},
     volume = {88},
     number = {1},
     year = {1995},
     zbl = {0855.11021},
     url = {http://geodesic.mathdoc.fr/item/MM2_1995__88_1_156134/}
}