Values of isotropic quadratic forms at S-integral points
Compositio Mathematica, Tome 83 (1992) no. 3, pp. 347-372. 
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     author = {Borel, Armand and Prasad, Gopal},
     title = {Values of isotropic quadratic forms at $S$-integral points},
     journal = {Compositio Mathematica},
     pages = {347--372},
     publisher = {Kluwer Academic Publishers},
     volume = {83},
     number = {3},
     year = {1992},
     mrnumber = {1175945},
     zbl = {0777.11008},
     language = {en},
     url = {http://www.numdam.org/item/CM_1992__83_3_347_0/}
}
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Borel, Armand; Prasad, Gopal. Values of isotropic quadratic forms at $S$-integral points. Compositio Mathematica, Tome 83 (1992) no. 3, pp. 347-372. http://www.numdam.org/item/CM_1992__83_3_347_0/

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