@article{IM_1990__102_2_143846,
     author = {J. Hoffstein and D., Friedberg, S. Bump},
     title = {Nonvanishing theorems for {L-functions} of modular forms and their derivatives.},
     journal = {Inventiones mathematicae},
     pages = {543--618},
     publisher = {mathdoc},
     volume = {102},
     number = {2},
     year = {1990},
     zbl = {0721.11023},
     url = {http://geodesic.mathdoc.fr/item/IM_1990__102_2_143846/}
}