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WikiPedia: Carduelis_citrinella http://globiz.sachsen.de/snsd/publikationen/Faun_A... http://www.birds.cornell.edu/clementschecklist/dow... http://www.ibercajalav.net/img/429_CitrilFinchScit... http://www.oiseaux.net/oiseaux/photos/venturon.mon... http://nou.natuurinfo.nl/website/ardea/ardea_show_... http://www.ardeola.org/files/1260.pdf http://www.ardeola.org/files/Ardeola_53(1)_115-126... //dx.doi.org/10.1007%2Fs10336-005-0032-6 //dx.doi.org/10.1007%2Fs10336-005-0072-y //dx.doi.org/10.1007%2Fs10336-006-0079-z