@incollection{129762,
  address          = {Bloomington},
  author           = {Mahmud, Ushari Ahmad},
  booktitle        = {Language spread},
  editor           = {Cooper, R. L.},
  pages            = {158-183},
  publisher        = {Indiana University Press},
  title            = {Language spread as a wavelike diffusion process: Arabic in the southern Sudan},
  year             = {1982},
  inlg             = {English [eng]},
  keywords         = {;nea;sdn;lng;scl;x.211i;z.x.210f;},
  lgcode           = {Sudanese Arabic [apd], Sudanese Creole Arabic [pga] (autotranslated from Maho's coding system)},
  macro_area       = {Africa},
  src              = {eballiso2009, weball},
  subject_headings = {nea, sdn, lng, scl, z.x.211}
}