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3 × 3 lemma for star-exact sequences

Bibliographic reference Gran, Marino ; Janelidze, Zurab ; Rodelo, Diana. 3 × 3 lemma for star-exact sequences. In: Homology, Homotopy and Applications, Vol. 14, no.2, p. 1-22 (2012)
Permanent URL http://hdl.handle.net/2078.1/114971