HELBIG AJ (1996) Nederlandse Ornithologische Unie: Themadag vogeltrek: Genetic basis and recent evoluton of migratory orientation in Palearctic warblers. LIMOSA 69 (2): 77-77.
Nederlandse Ornithologische Unie: Themadag vogeltrek: Genetic basis and recent evoluton of migratory orientation in Palearctic warblers
