On centralizers of involutions having a component of type A 6 and A 7
Rendiconti del Seminario Matematico della Università di Padova, Tome 54 (1975), pp. 1-29. 
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     author = {Fritz, Franz J.},
     title = {On centralizers of involutions having a component of type $A_6$ and $A_7$},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {1--29},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {54},
     year = {1975},
     mrnumber = {435205},
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     url = {http://archive.numdam.org/item/RSMUP_1975__54__1_0/}
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Fritz, Franz J. On centralizers of involutions having a component of type $A_6$ and $A_7$. Rendiconti del Seminario Matematico della Università di Padova, Tome 54 (1975), pp. 1-29. http://archive.numdam.org/item/RSMUP_1975__54__1_0/

[1] M. Aschbacher, On finite groups of component type (to appear). | MR | Zbl

[2] M. Aschbacher, Standard components of alternating type centralized by a four-group (to appear).

[3] D. Gorenstein, Finite groups, Harper and Row, 1968. | MR | Zbl

[4] G. Stroth (unpublished).

[5] G.N. Thwaites, A characterization of M12 by centralizer of involution, Quarterly J. of Math., 24 (1073), pp. 537-557. | MR | Zbl