@article{IM_1986__84_143341,
     author = {B.H. Gross and D.B. Zagier},
     title = {Heegner points and derivatives of {L-series.}},
     journal = {Inventiones mathematicae},
     pages = {225--320},
     publisher = {mathdoc},
     volume = {84},
     year = {1986},
     zbl = {0608.14019},
     url = {http://geodesic.mathdoc.fr/item/IM_1986__84_143341/}
}