@InProceedings{Lehre2010PopNegDrift,
  author =    {Per Kristian Lehre},
  title =     {Negative Drift in Populations},
  booktitle = {Proceedings of Parallel Problem Solving from Nature - (PPSN XI)},
  year =      2011,
  pages =     {244-253},
  volume =    {6238},
  series =    {LNCS},
  publisher = {Springer Berlin / Heidelberg}
}