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1.
Hopf algebras and congruence subgroups

by Sommerhauser, Yorck | Zhu, Yongchang.

Series: Memoirs of the American Mathematical SocietyMaterial type: Computer file Computer file; Format: electronic Publication details: Providence, R.I. : American Mathematical Society, c2011Online access: Click here to access online Availability: Items available for reference: Accessible Online (1). : Location(s): .

2.
On higher Frobenius-Schur indicators

by Kashina, Yevgenia | Sommerhauser, Yorck,Zhu, Yongchang.

Series: Memoirs of the American Mathematical SocietyMaterial type: Computer file Computer file; Format: electronic Publication details: Providence, R.I. : American Mathematical Society, c2006Online access: Click here to access online Availability: Items available for reference: Accessible Online (1). : Location(s): .