Published in Hedwigia, in 1895, in volume 34, pages 173-180

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Published in Journal für Ornithologie, in 1892, in volume 40, pages 443-456

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Published in Hedwigia, in 1888, in volume 27, pages 221-249

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Published in Hedwigia, in 1889, in volume 28, pages 309-347

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Published in Hedwigia, in 1906, in volume 46, pages 279-287

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