Literatur
Dr.Erwin Stresemann, „Avifauna Macedonica“, München 1920.
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Natorp, O. Beitrag zur Kenntnis der Kleider vonPlectrophenax nivalis nivalis (L.). J. Ornithol 79, 338–346 (1931). https://doi.org/10.1007/BF01953007
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DOI: https://doi.org/10.1007/BF01953007