The classification of groups in which every product of four elements can be reordered
Rendiconti del Seminario Matematico della Università di Padova, Tome 93 (1995), pp. 7-26. 
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     author = {Longobardi, Patrizia and Maj, Mercede and Stonehewer, Stewart},
     title = {The classification of groups in which every product of four elements can be reordered},
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     pages = {7--26},
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     year = {1995},
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     url = {http://www.numdam.org/item/RSMUP_1995__93__7_0/}
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Longobardi, Patrizia; Maj, Mercede; Stonehewer, Stewart. The classification of groups in which every product of four elements can be reordered. Rendiconti del Seminario Matematico della Università di Padova, Tome 93 (1995), pp. 7-26. http://www.numdam.org/item/RSMUP_1995__93__7_0/

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