@techreport{plt-tr2004-t-y-scheme-v209,
  author = {Dorai Sitaram},
  title = {Teach Yourself Scheme in Fixnum Days},
  number = {PLT-TR2004-t-y-scheme-v209},
  type = {Introduction},
  institution = {PLT Scheme Inc.},
  month = {December},
  year = {2004},
  url = {http://download.plt-scheme.org/doc/209/pdf/t-y-scheme.pdf},
  note = {\url{http://plt-scheme.org/techreports/}}
}