@inbook{4334,
  author       = {Hewitt, Godfrey and Barton, Nicholas H},
  booktitle    = {Insect Cytogenetics},
  editor       = {Blackman, Roger and Ashburner, Michael},
  isbn         = {9-780-6320-0552-9},
  pages        = {149 -- 170},
  publisher    = {Wiley-Blackwell},
  title        = {{The structure and maintenance of hybrid zones as exemplified by Podisma pedestris}},
  volume       = {10},
  year         = {1980},
}