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2“... attempt however was made by Sverdrup and Munk (1947), when the outbreak of world war II made it necessary...”
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3by Hogan-Warburg, Alida Johanna“... on different aspects of the Ruff's breeding behavior (e.g., CHRISTOLEIT 1924; ARMSTRONG 1947; TINBERGEN 1959...”
Published 1965
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Doctoral or Postdoctoral Thesis