Questions on set squaring in groups
Structure theory of set addition, Astérisque, no. 258 (1999), pp. 249-253. 
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     author = {Berkovich, Yakov},
     title = {Questions on set squaring in groups},
     booktitle = {Structure theory of set addition},
     editor = {Deshouilliers Jean-Marc and Landreau Bernard and Yudin Alexander A.},
     series = {Ast\'erisque},
     pages = {249--253},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {258},
     year = {1999},
     mrnumber = {1701202},
     zbl = {0945.20015},
     language = {en},
     url = {http://www.numdam.org/item/AST_1999__258__249_0/}
}
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Berkovich, Yakov. Questions on set squaring in groups, dans Structure theory of set addition, Astérisque, no. 258 (1999), pp. 249-253. http://www.numdam.org/item/AST_1999__258__249_0/

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