@inbook{4275,
  author       = {Barton, Nicholas H},
  booktitle    = {Encyclopedia of Biodiversity},
  isbn         = {9780122268656},
  pages        = {85 -- 94},
  publisher    = {Academic Press},
  title        = {{Differentiation}},
  doi          = {10.1016/B0-12-226865-2/00070-5},
  year         = {2000},
}