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3. Examples of liftings of Nichols algebras over racks;Andruskiewitsch;Algebra Montp. Announc.,2003
4. On the classification of finite-dimensional pointed Hopf algebras;Andruskiewitsch;Ann. of Math.,2010
5. Finite dimensional Hopf algebras over the dual group algebra of the symmetric group in three letters;Andruskiewitsch;Comm. Algebra,2011