Koyama, Kazuo
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2019: Wildfowl Special Issue No. 5 - Standard Papers
Living child-free: proposal for density-dependent regulation in Bewick’s Swans Cygnus columbianus bewickii
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2020: Wildfowl Special Issue No. 6 - Standard Papers
Two distinct flyways with different population trends of Bewick's Swan Cygnus columbianus bewickii in East Asia
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2020: Wildfowl Special Issue No. 6 - Standard Papers
Migration routes and conservation status of the Whooper Swan Cygnus cygnus in East Asia
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2020: Wildfowl Special Issue No. 6 - Standard Papers
Flyway structure, breeding, migration and wintering distributions of the globally threatened Swan Goose Anser cygnoides in East Asia
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2020: Wildfowl Special Issue No. 6 - Standard Papers
Population trends and migration routes of the East Asian Bean Goose Anser fabalis middendorffii and A. f. serrirostris
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2020: Wildfowl Special Issue No. 6 - Standard Papers
Contrasting trends in two East Asian populations of the Greater White-fronted Goose Anser albifrons
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