On the computation of the order of Janko’s first simple group 𝔉 1
Rendiconti del Seminario Matematico della Università di Padova, Tome 46 (1971), pp. 371-374. 
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     author = {Dietzsch, Herbert},
     title = {On the computation of the order of {Janko{\textquoteright}s} first simple group $\mathfrak {F}_1$},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {371--374},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {46},
     year = {1971},
     mrnumber = {302755},
     zbl = {0239.20017},
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     url = {http://archive.numdam.org/item/RSMUP_1971__46__371_0/}
}
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Dietzsch, Herbert. On the computation of the order of Janko’s first simple group $\mathfrak {F}_1$. Rendiconti del Seminario Matematico della Università di Padova, Tome 46 (1971), pp. 371-374. http://archive.numdam.org/item/RSMUP_1971__46__371_0/

[1] Janko, Z.: A new finite simple group with abelian Sylow-2-subgroups and its characterization, Journal of Algebra 3 (2) (1966), 147-186. | MR | Zbl

[2] Suzuki, M.: Applications of group characters, Proc. Symp. Pure Math. 1 (1959), 88-89. | MR | Zbl