P. Beresford, F. K. Barker, P. G. Ryan und T. M. Crowe: African endemics span the tree of songbirds (Passeri): Molecular systematics of several evolutionary "enigmas". In: Proc. R. Soc. Lond. B. Band272, 2005, S.849–858, doi:10.1098/rspb.2004.2997, PMID 15888418 (royalsocietypublishing.org [PDF]).
P. Beresford, F. K. Barker, P. G. Ryan und T. M. Crowe: African endemics span the tree of songbirds (Passeri): Molecular systematics of several evolutionary "enigmas". In: Proc. R. Soc. Lond. B. Band272, 2005, S.849–858, doi:10.1098/rspb.2004.2997, PMID 15888418 (royalsocietypublishing.org [PDF]).
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P. Beresford, F. K. Barker, P. G. Ryan und T. M. Crowe: African endemics span the tree of songbirds (Passeri): Molecular systematics of several evolutionary "enigmas". In: Proc. R. Soc. Lond. B. Band272, 2005, S.849–858, doi:10.1098/rspb.2004.2997, PMID 15888418 (royalsocietypublishing.org [PDF]).