Richard Klim
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Lopes & Gonzaga 2012. Clinal pattern of morphological variation in Sakesphorus luctuosus (Lichtenstein, 1823), with comments on the enigmatic Sakesphorus hagmanni Miranda-Ribeiro, 1927 (Passeriformes: Thamnophilidae). Zootaxa 3569: 41–54. [preview]
Zimmer & Isler 2003 (HBW 8).
Zimmer & Isler 2003 (HBW 8).
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