Torsion in elliptic curves over k(t)
Compositio Mathematica, Tome 41 (1980) no. 3, pp. 337-354. 
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     author = {Cox, David A. and Parry, Walter R.},
     title = {Torsion in elliptic curves over $k(t)$},
     journal = {Compositio Mathematica},
     pages = {337--354},
     publisher = {Sijthoff et Noordhoff International Publishers},
     volume = {41},
     number = {3},
     year = {1980},
     mrnumber = {589086},
     zbl = {0442.14015},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1980__41_3_337_0/}
}
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Cox, David A.; Parry, Walter R. Torsion in elliptic curves over $k(t)$. Compositio Mathematica, Tome 41 (1980) no. 3, pp. 337-354. http://archive.numdam.org/item/CM_1980__41_3_337_0/

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[3] G. Shimura: Arithmetic theory of automorphic functions. Princeton U. Press, Princeton, 1971. | Zbl

[4] T. Shioda: Elliptic modular surfaces. J. Math. Soc. Japan, 24 (1972) 20-59. | MR | Zbl