abstract] doi:10.1007/BF01652928 Sangster, George; Knox, Alan G.; Helbig, Andreas J.; Parkin, David T. (2002). "Taxonomic recommendations for European...
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History of the County of Buckinghamshire. Vol. 1. p. 132. Clement, P.; Helbig, Andreas J. (1998). "Taxonomy and identification of chiffchaffs in the Western...
39 KB (4,412 words) - 18:53, 24 August 2024
1642/0004-8038(2005)122[0121:POTPIS]2.0.CO;2. Sangster, George; Collinson, J Martin; Helbig, Andreas J; Knox, Alan G; Parkin, David T (2005). "Taxonomic recommendations...
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HarperCollins. ISBN 0-00-219728-6. Parkin, David T.; Collinson, Martin; J. Helbig, Andreas; Knox, Alan G.; Sangster, George; Svensson, Lars (2004). "Species limits...
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1111/ibi.12686. hdl:2263/68189. Shirihai, Hadoram; Gargallo, Gabriel; Helbig, Andreas J. (2001). Sylvia Warblers: Identification, Taxonomy and Phylogeny...
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Zeitschrift für Zoologische Systematik und Evolutionsforschung 20: 82–100. Helbig, Andreas J.; Martens, Jochen; Seibold, I.; Henning, F.; Schottler, B; Wink,...
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Bird Names. London: Christopher Helm. p. 192. ISBN 978-1-4081-2501-4. Helbig, Andreas J.; Kocum, Annett; Seibold, Ingrid; Braun, Michael J. (2004). "A multi-gene...
16 KB (1,456 words) - 21:34, 29 September 2024
T22729528A87661577.en. Retrieved 19 November 2021. Sangster, George; Knox, Alan G.; Helbig, Andreas J.; Parkin, David T. (2002). "Taxonomic recommendations for European...
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T22729533A118845180.en. Retrieved 18 November 2021. Sangster, George; Knox, Alan G.; Helbig, Andreas J. & Parkin, David T. (2002): Taxonomic recommendations for European...
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December 2018. Retrieved 3 April 2019. Sangster, George; Knox, Alan G.; Helbig, Andreas J.; Parkin, David T. (2002). "Taxonomic recommendations for European...
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