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2. About Nightingales (Luscinia megarhynchos), Thrush Nightingales (Luscinia luscinia) and their hybrids – further results of an investigation via bird ringing in the Frankfurt (Oder) area;Becker;Vogelwarte,2007
3. Interspecific territorialism and competition in Acrocephalus warblers as revealed by playback experiments in areas of sympathy and allopatry;Catchpole;Behavioural Ecology,1978
4. Bird song. Biological themes and variations;Catchpole,2008
5. Convergent characteristics in sympatric species: a possible relation to interspecific competition and aggression;Cody;Condor,1969