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Hogstad, O. 2008. Sexual bill dimorphism supports separation of the woodpecker genera Dendrocopos Koch (1816) in the Palaearctic and Picoides Lacépède (1799) in the Nearctic. Ornis Norvegica. 31, (Jan. 2008), 183-188. DOI:https://doi.org/10.15845/on.v31i0.167.