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REFERENCES

  • Benninghoff, W. S. (1962). Calculation of pollen and spore density in sediments by addition of exotic pollen in known quantities. Pollen Spores, 4(2), 332.
  • Davis, M. B. (1965). A method for determination of absolute pollen frequency. In: Handbook of Palaeontological Techniques (Ed. by B.Kummel & D.Roup), pp. 674686. Freeman, San Francisco .
  • Faegri, K. & Iversen, J. (1964). Textbook of Pollen Analysis. Blackwell Scientific Publications, Oxford .