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De Sole A, Kac VG, Valeri D. Classical W-algebras and generalized Drinfeld-Sokolov bi-Hamiltonian  systems within the theory of Poisson vertex algebras. Communications in Mathematical Physics 323, nr. 2 (2013) 663-711 [Internet]. 2013  . Available from: http://hdl.handle.net/1963/6978