A note on the Jordan-Hölder theorem
Rendiconti del Seminario Matematico della Università di Padova, Tome 80 (1988), pp. 25-32. 
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     author = {Ballester, A. and Ezquerro, L. M.},
     title = {A note on the {Jordan-H\"older} theorem},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {25--32},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {80},
     year = {1988},
     mrnumber = {988109},
     zbl = {0665.20011},
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     url = {http://www.numdam.org/item/RSMUP_1988__80__25_0/}
}
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Ballester, A.; Ezquerro, L. M. A note on the Jordan-Hölder theorem. Rendiconti del Seminario Matematico della Università di Padova, Tome 80 (1988), pp. 25-32. http://www.numdam.org/item/RSMUP_1988__80__25_0/

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