Ghilarov M. S., 1982: To the 60th anniversary of the development of entomology in the Union republics and in the branches of the All-Union entomological society. 10 pp. (in Russian). Entomologitsheskoe obozrenie 61(4): 665-674.
 
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Grouw H. van, Steinheimer F. D., 2008: Charles Darwin’s lost cinereous harrier found in the collection of the National Museum of Natural History Leiden. 4 pp. Zoologische Mededelingen 82: 595-598.