Semi-characteristics and free group actions
Compositio Mathematica, Tome 29 (1974) no. 3, pp. 223-248. 
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     number = {3},
     year = {1974},
     mrnumber = {377943},
     zbl = {0294.57021},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1974__29_3_223_0/}
}
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Stong, R. E. Semi-characteristics and free group actions. Compositio Mathematica, Tome 29 (1974) no. 3, pp. 223-248. http://archive.numdam.org/item/CM_1974__29_3_223_0/

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