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References

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  • Darwin, C. (1873). The Different Forms of Flowers on Plants of the Same Species. John Murray, London .
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  • Dupperrex, A. (1961). Orchids of Europe. Blandford Press, London .
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  • Grant, V. (1963). The Origin of Adaptation. Columbia University Press, New York .
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  • Nevo, E. (1978). Genetic variation in natural populations: patterns and theory. Theoretical Population Biology 13, 121.
  • Peisl, P. & Forster, J. (1975). Zur Bestaubungsbiologie des Knaubenkrautes Orchis coriophora L. ssp. fragrans. Die Orchidee, 26, 172.
  • Plijl, L. van der & Dodson, C. H. (1966). Orchid Flowers Their Pollination and Evolution. University of Miami Press, Coral Gables .
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  • Shmida, A. & Dafni, A. (1975). The Horshat Tal Orchids Reserve. In: Researches and Surveys (Ed. by U.Paz). pp. 224239.Nature Reserve Authority, Tel-Aviv (in Hebrew).
  • Soó, R. (1972). Die Arten and Unterarten der Gattung Orchis s. str. Bericht Naturwissenschaftlichen für Wuppertal, 25, 37.
  • Teschner, W. (1975). The orchids of Europe, some facts and problems. American Orchid Society Bulletin, 44, 288.
  • Vogel, S. (1972). Pollination von Orchis papilionaceae in Schwarmbahnen von Eucera tuberculata. Bericht Naturwissenschaftlichen Vereins für Wuppertal, 25, 267.
  • Vöth, W. (1975). Trielis villosa var. rubra Bestäuber von Orchis coriophora. Die Orchidee, 26, 170.