no. 2
Supersingular primes for elliptic curves over real number fields
Compositio Mathematica, Tome 72 (1989) no. 2, pp. 165-172 
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     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/}
}
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Elkies, Noam D. Supersingular primes for elliptic curves over real number fields. Compositio Mathematica, Tome 72 (1989) no. 2, pp. 165-172. https://www.numdam.org/item/CM_1989__72_2_165_0/

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