On some questions concerning permutable subgroups of finitely generated groups and projectivities of perfect groups
Rendiconti del Seminario Matematico della Università di Padova, Tome 87 (1992), pp. 303-305. 
@article{RSMUP_1992__87__303_0,
     author = {Busetto, Giorgio and Napolitani, Franco},
     title = {On some questions concerning permutable subgroups of finitely generated groups and projectivities of perfect groups},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {303--305},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {87},
     year = {1992},
     mrnumber = {1183914},
     zbl = {0815.20017},
     language = {en},
     url = {http://archive.numdam.org/item/RSMUP_1992__87__303_0/}
}
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Busetto, Giorgio; Napolitani, Franco. On some questions concerning permutable subgroups of finitely generated groups and projectivities of perfect groups. Rendiconti del Seminario Matematico della Università di Padova, Tome 87 (1992), pp. 303-305. http://archive.numdam.org/item/RSMUP_1992__87__303_0/

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