Trinomen: Perbedaan antara revisi

<ref name=Stresemann>{{cite journal|author=Stresemann, Ernst |year=1936|title= The Formenkreis-Theory|journal=[[Auk (journal)|Auk]]|volume=53|issue=2|pages= 150–158|url=http://sora.unm.edu/sites/default/files/journals/auk/v053n02/p0150-p0158.pdf|doi=10.2307/4077273}}</ref>

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