* Johansson, Ulf S. & Ericson, Per G. P. ( 2003 ): Molecular support for a sister group relationship between Pici and Galbulae ( Piciformes sensu Wetmore 1960 ).
* Johansson, Ulf S. & Ericson, Per G. P. ( 2003 ): Molecular support for a sister group relationship between Pici and Galbulae ( Piciformes sensu Wetmore 1960 ).
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