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Ovaskainen, Otso, Alan D. Smith, Juliet L. Osborne, Don R. Reynolds, Norman L. Carreck, Andrew P. Martin, Kristjan Niitepõld, ja Ilkka Hanski. Tracking Butterfly Movements With Harmonic Radar Reveals an Effect of Population Age On Movement Distance. National Academy of Sciences, 2008.

Ovaskainen, Otso, et al. Tracking Butterfly Movements With Harmonic Radar Reveals an Effect of Population Age On Movement Distance. National Academy of Sciences, 2008.