@article{IM_1987__90_143528,
     author = {A. Bertram},
     title = {An existence theorem for {Prym} special divisors.},
     journal = {Inventiones mathematicae},
     pages = {669--671},
     publisher = {mathdoc},
     volume = {90},
     year = {1987},
     zbl = {0646.14006},
     url = {http://geodesic.mathdoc.fr/item/IM_1987__90_143528/}
}