@InProceedings{herraiz09:_statistical_properties_evolution,
  author     = 	 {Israel Herraiz},
  title      = 	 {A statistical examination of the evolution and properties of libre software},
  booktitle  =   {Proceedings of the 25th IEEE International Conference on Software Maintenance (ICSM)},
  pages      = 	 {439-442},
  year       = 	 {2009},
  publisher  =   {IEEE Computer Society},
}