@Booklet{ltxb,
  title = 	 {Introduktion til {\LaTeX}},
  OPTkey = 	 {},
  author = 	 {Lars Madsen},
  howpublished = {\url{http://www.imf.au.dk/system/latex/bog/}},
  OPTaddress = 	 {},
  OPTmonth = 	 {},
  year = 	 {2010},
  note = 	 {The current version of the book is 3rd edition beta.},
  OPTannote = 	 {}
}

@Book{swanson,
  author = 	 {Swanson, Ellen},
  ALTeditor = 	 {},
  title = 	 {Mathematics into {T}ype},
  publisher = 	 {American Mathematical Society},
  year = 	 {1999},
  OPTkey = 	 {},
  OPTvolume = 	 {},
  OPTnumber = 	 {},
  OPTseries = 	 {},
  OPTaddress = 	 {},
  OPTedition = 	 {},
  OPTmonth = 	 {},
  note = 	 {
                 An set of old notes, updated in 1999 by
                 Arlene O'Sean og Antoinette Schleyer.},
  OPTannote = 	 {}
}