On the order of vanishing of modular L-functions at the critical point
Henryk Iwaniec
Journal de Théorie des Nombres de Bordeaux, Tome 2 (1990) no. 2, pp. 365-376. 
@article{JTNB_1990__2_2_365_0,
     author = {Iwaniec, Henryk},
     title = {On the order of vanishing of modular $L$-functions at the critical point},
     journal = {Journal de Th\'eorie des Nombres de Bordeaux},
     pages = {365--376},
     publisher = {Universit\'e Bordeaux I},
     volume = {2},
     number = {2},
     year = {1990},
     doi = {10.5802/jtnb.33},
     zbl = {0719.11029},
     mrnumber = {1081731},
     language = {en},
     url = {https://jtnb.centre-mersenne.org/articles/10.5802/jtnb.33/}
}
Henryk Iwaniec. On the order of vanishing of modular $L$-functions at the critical point. Journal de Théorie des Nombres de Bordeaux, Tome 2 (1990) no. 2, pp. 365-376. doi : 10.5802/jtnb.33. https://jtnb.centre-mersenne.org/articles/10.5802/jtnb.33/

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