On the projective characters in characteristic 2 of the groups Suz(2 m ) and Sp 4 (2 n )
Publications Mathématiques de l'IHÉS, Tome 51 (1980), pp. 9-35. 
@article{PMIHES_1980__51__9_0,
     author = {Chastkofsky, Leonard and Feit, Walter},
     title = {On the projective characters in characteristic 2 of the groups $Suz (2^m)$ and $Sp_4(2^n)$},
     journal = {Publications Math\'ematiques de l'IH\'ES},
     pages = {9--35},
     publisher = {Institut des Hautes \'Etudes Scientifiques},
     volume = {51},
     year = {1980},
     mrnumber = {573820},
     zbl = {0437.20007},
     language = {en},
     url = {http://archive.numdam.org/item/PMIHES_1980__51__9_0/}
}
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Chastkofsky, Leonard; Feit, Walter. On the projective characters in characteristic 2 of the groups $Suz (2^m)$ and $Sp_4(2^n)$. Publications Mathématiques de l'IHÉS, Tome 51 (1980), pp. 9-35. http://archive.numdam.org/item/PMIHES_1980__51__9_0/

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