@article{HHKR89,
  key      = {HHKR89},
  author   = {J. Heering and P. R. H. Hendriks and P. Klint and J. Rekers},
  title    = {{T}he syntax definition formalism {SDF} -- Reference Manual},
  journal  = {SIGPLAN Notices},
  year     = {1989},
  volume   = {24},
  number   = {11},
  pages    = {43--75},
  inbib    = {EV},
  annotate = {Most recent version available at ftp://ftp.cwi.nl/pub/gipe/reports/SDFManual.ps.Z},
  url      = {http://ftp.cwi.nl/pub/gipe/reports/SDFManual.ps.Z},
  fileurl  = {http://ftp.cwi.nl/pub/gipe/reports/SDFManual.ps.Z},
  project  = {SDF},
}