Morton L. Isler, Phyllis R. Isler, Bret M. Whitney, Biogeography and Systematics of the Thamnophilus punctatus (Thamnophilidae) Complex, Ornithological Monographs, No. 48, Studies in Neotropical Ornithology Honoring Ted Parker (1997), pp. 355-381
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Isler et al. (1997) studied this question.
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