Richard Klim
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Martin Garner's Birding Frontiers blog provides another useful reference list by Joe Hobbs:
birdingfrontiers.com/2011/03/08/next-amazing-resources
birdingfrontiers.com/2011/03/08/next-amazing-resources
- Hobbs 2011. List of Phylloscopus with References. v1.4.
birdingfrontiers.files.wordpress.com/2011/03/phylloscopus-reference-list.pdf