On deficient products in infinite groups
Rendiconti del Seminario Matematico della Università di Padova, Tome 93 (1995), pp. 1-6. 
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     author = {Herzog, Marcel and Menegazzo, Federico},
     title = {On deficient products in infinite groups},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {1--6},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {93},
     year = {1995},
     mrnumber = {1354347},
     zbl = {0839.20042},
     language = {en},
     url = {http://archive.numdam.org/item/RSMUP_1995__93__1_0/}
}
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Herzog, Marcel; Menegazzo, Federico. On deficient products in infinite groups. Rendiconti del Seminario Matematico della Università di Padova, Tome 93 (1995), pp. 1-6. http://archive.numdam.org/item/RSMUP_1995__93__1_0/

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