Bounds for the number of connected components and the first Betti number mod two of a real algebraic surface
Compositio Mathematica, Tome 60 (1986) no. 1, pp. 53-63. 
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     title = {Bounds for the number of connected components and the first {Betti} number mod two of a real algebraic surface},
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     volume = {60},
     number = {1},
     year = {1986},
     mrnumber = {867956},
     zbl = {0608.14028},
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     url = {http://archive.numdam.org/item/CM_1986__60_1_53_0/}
}
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Silhol, R. Bounds for the number of connected components and the first Betti number mod two of a real algebraic surface. Compositio Mathematica, Tome 60 (1986) no. 1, pp. 53-63. http://archive.numdam.org/item/CM_1986__60_1_53_0/

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