@article{4304,
  author       = {Barton, Nicholas H},
  issn         = {0960-9822},
  journal      = {Current Biology},
  number       = {11},
  pages        = {797 -- 799},
  publisher    = {Cell Press},
  title        = {{Why species and subspecies?}},
  doi          = {10.1016/0960-9822(93)90036-N},
  volume       = {3},
  year         = {1993},
}