@article{Kowalczuk:1999,
  author  = "M. Kowalczuk and A. Gierlik and P. Mackiewicz and S. Cebrat and M. Dudek",
  title   = "Optimization of gene sequences under constant mutational pressure and selection",
  journal = "Physica A",
  volume  = "Vol. 273",
  number  = "no 1-2",
  pages   = "116--131",
  year    = "1999",
}