A block-theory-free characterization of M 24
Rendiconti del Seminario Matematico della Università di Padova, Tome 82 (1989), pp. 133-150. 
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     author = {Held, D. and Hrab\v{e} de Angelis, J.},
     title = {A block-theory-free characterization of $M_{24}$},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {133--150},
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     volume = {82},
     year = {1989},
     mrnumber = {1049588},
     zbl = {0705.20013},
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     url = {http://archive.numdam.org/item/RSMUP_1989__82__133_0/}
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Held, D.; Hrabě de Angelis, J. A block-theory-free characterization of $M_{24}$. Rendiconti del Seminario Matematico della Università di Padova, Tome 82 (1989), pp. 133-150. http://archive.numdam.org/item/RSMUP_1989__82__133_0/

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