@article{MZ_1996__222_3_174882,
     author = {Vassil Kanev},
     title = {Special line bundles on curves with involution.},
     journal = {Mathematische Zeitschrift},
     pages = {213--230},
     year = {1996},
     volume = {222},
     number = {3},
     zbl = {0864.14018},
     url = {http://geodesic.mathdoc.fr/item/MZ_1996__222_3_174882/}
}