[1]
Lopes, L.E. and Gonzaga, L.P. 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, 1 (Nov. 2012), 41–54. DOI:https://doi.org/10.11646/zootaxa.3569.1.3.