Fields of definition of algebraic varieties in characteristic zero
Compositio Mathematica, Tome 61 (1987) no. 3, pp. 339-352. 
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     author = {Buium, Alexandru},
     title = {Fields of definition of algebraic varieties in characteristic zero},
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     pages = {339--352},
     publisher = {Martinus Nijhoff Publishers},
     volume = {61},
     number = {3},
     year = {1987},
     mrnumber = {883487},
     zbl = {0643.14011},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1987__61_3_339_0/}
}
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Buium, Alexandru. Fields of definition of algebraic varieties in characteristic zero. Compositio Mathematica, Tome 61 (1987) no. 3, pp. 339-352. http://archive.numdam.org/item/CM_1987__61_3_339_0/

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