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D. Garlaschelli and M. I. Loffredo, Patterns of Link Reciprocity in Directed Networks, Physical Review Letters, vol.93, issue.26, pp.93-268701, 2004.
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D. Garlaschelli and M. I. Loffredo, Multispecies grand-canonical models for networks with reciprocity, Physical Review E, vol.73, issue.1, p.15101, 2004.
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