Two major accretion epochs in M31 from two distinct populations of globular clusters
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M. Irwin | N. Tanvir | Z. Wan | R. Ibata | G. Lewis | A. Ferguson | A. McConnachie | P. Côté | M. Collins | A. Huxor | J. Peñarrubia | B. Brewer | J. Veljanoski | D. Mackey | N. Martin