Josef Hofbauer and Karl Sigmund:
Abstract. A dynamics for frequency dependent selection is proposed and applied to several biological examples. The relation with game dynamics and evolutionary stability is analyzed.
Download: dvi-file (of the preprint, without figures), scanned reprint
See also chapter 9 of our book Evolutionary Games and Population Dynamics (Cambridge University Press 1998), pp.101 ff.
For further developments see Eva Kisdi's adaptive dynamics webpages.