1. D.J. Cavicchio, ‘Adaptive search using simulated evolution’, Ph.D. Thesis, Univ. Michigan, 1970
2. K. A. De Jong, ‘Analysis of the behavior of a class of genetic adaptive systems’, Ph.D. Thesis, Univ. Michigan, Univ.Abst.Inter. 36(10), 5140B, 1975.
3. S.W. Mahfoud, ‘Crowding and preselection revisited’, Proc. 2nd Conf. Parallel Problem Solving from Nature, pp.27-36, 1992.
4. David E. Goldberg and Joh Richardson, ‘Genetic algorithms with sharing for multimodal function optimization’, Proc. 2nd Inter. Conf. Genetic Algorithms, pp.41-49., 1987
5. Kalyanmoy Deb and David E. Goldberg, ‘An Investigation of Niche and Species Formation in Genetic Function Optimization’, Proc. 3rd Inter. Conf. Genetic Algorithms, pp.42-50, 1989