@article{CM_1989__72_2_165_0,
     author = {Elkies, Noam D.},
     title = {Supersingular primes for elliptic curves over real number fields},
     journal = {Compositio Mathematica},
     pages = {165--172},
     year = {1989},
     publisher = {Kluwer Academic Publishers},
     volume = {72},
     number = {2},
     mrnumber = {1030140},
     zbl = {0708.14020},
     language = {en},
     url = {https://www.numdam.org/item/CM_1989__72_2_165_0/}
}