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Moller, Anders Pape; Hoglund, Jacob (1991), "Patterns of Fluctuating Asymmetry in Avian Feather Ornaments: Implications for Models of Sexual Selection", Proceedings: Biological Sciences, 245 (1312): 1–5, Bibcode:1991RSPSB.245....1P, doi:10.1098/rspb.1991.0080, S2CID84991514
Moller, Anders Pape; Hoglund, Jacob (1991), "Patterns of Fluctuating Asymmetry in Avian Feather Ornaments: Implications for Models of Sexual Selection", Proceedings: Biological Sciences, 245 (1312): 1–5, Bibcode:1991RSPSB.245....1P, doi:10.1098/rspb.1991.0080, S2CID84991514