A non-commutative free algebra of rank 0
Rendiconti del Seminario Matematico della Università di Padova, Tome 77 (1987), pp. 207-211 
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     author = {Wiegold, James},
     title = {A non-commutative free algebra of rank $0$},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {207--211},
     year = {1987},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {77},
     mrnumber = {904622},
     zbl = {0625.08006},
     language = {en},
     url = {https://www.numdam.org/item/RSMUP_1987__77__207_0/}
}
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Wiegold, James. A non-commutative free algebra of rank $0$. Rendiconti del Seminario Matematico della Università di Padova, Tome 77 (1987), pp. 207-211. https://www.numdam.org/item/RSMUP_1987__77__207_0/

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