Residually finite groups with the same finite images
Compositio Mathematica, Tome 29 (1974) no. 3, pp. 249-252. 
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     author = {Baumslag, Gilbert},
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     pages = {249--252},
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     number = {3},
     year = {1974},
     mrnumber = {357615},
     zbl = {0309.20007},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1974__29_3_249_0/}
}
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Baumslag, Gilbert. Residually finite groups with the same finite images. Compositio Mathematica, Tome 29 (1974) no. 3, pp. 249-252. http://archive.numdam.org/item/CM_1974__29_3_249_0/

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