Andersen B.G., Borns Jr. H.W., 1994. The Ice Age World. Scandinavian university Press, Oslo.

Pielou E.C., 1991. After The Ice Age. The University of Chicago Press, Chicago anf London.

Prentice I.C., 1992. Climate Change and Long-Term Vegetation Dynamics. In. Glenn-Lewin D.C., Peet R.K., Veblen T.T., eds. Plant Succession, Theory and Prediction. Chapman and Hall, London.

Raven P.H., Johnson G.B., 1992. Biology, Third Edition. Mosby Year Book, St. Louis.

Sauer J.D., 1988. Plant Migration, The Dynamics of Geographic Patterning in Seed Plant Species. University of California Press, Ltd. Berkely and Los Angeles, California