Nocturnal Flight Calls
Mills, H. G. 2000
Geographically distributed acoustical monitoring of migrating birds. Journal of the Acoustical Society of America, 108(5, part 2): 2582.
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Mills, H. G. 1995.
Automatic detection and classification of nocturnal migrant bird calls. Journal of the Acoustical Society of America, 97(5): 3370.