@article{IM_1978__44_142524,
     author = {B. Mazur},
     title = {Rational {Isogenies} of {Prime} {Degree.}},
     journal = {Inventiones mathematicae},
     pages = {129--162},
     year = {1978},
     volume = {44},
     zbl = {0386.14009},
     url = {http://geodesic.mathdoc.fr/item/IM_1978__44_142524/}
}