title: What is proper vouchering in phylogenetic studies of birds?--a reply to Peterson et al. (2007).
authors.forename: Urban
authors.initials: U
authors.lastname: Olsson
authors.forename: Per
authors.initials: P
authors.lastname: Sundberg
authors.forename: Per
authors.initials: P
authors.lastname: Alström
authors.forename: Magnus
authors.initials: M
authors.lastname: Gelang
authors.forename: Per G P
authors.initials: PG
authors.lastname: Ericson
mesh_terms: D000818:Animals; D001717:Birds / Q000145:classification* / Q000235:genetics*; D010802:Phylogeny