@techreport{plt-tr2003-t-y-scheme-v204,
  author = {Dorai Sitaram},
  title = {Teach Yourself Scheme in Fixnum Days},
  number = {PLT-TR2003-t-y-scheme-v204},
  type = {Introduction},
  institution = {PLT Scheme Inc.},
  month = {May},
  year = {2003},
  url = {http://download.plt-scheme.org/doc/204/pdf/t-y-scheme.pdf},
  note = {\url{http://plt-scheme.org/techreports/}}
}