On the squares of sets of linear groups
Rendiconti del Seminario Matematico della Università di Padova, Tome 75 (1986), pp. 253-256 
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     author = {Ambrosiewicz, Jan},
     title = {On the squares of sets of linear groups},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {253--256},
     year = {1986},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {75},
     mrnumber = {847670},
     zbl = {0591.20048},
     language = {en},
     url = {https://www.numdam.org/item/RSMUP_1986__75__253_0/}
}
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Ambrosiewicz, Jan. On the squares of sets of linear groups. Rendiconti del Seminario Matematico della Università di Padova, Tome 75 (1986), pp. 253-256. https://www.numdam.org/item/RSMUP_1986__75__253_0/

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