@techreport{1998-vanLeijenhorst-GA�sAddendum,
  author		= "{van Leijenhorst}, D.C.",
  title			= "{GA{\"{\i}}{?'}½s in Optical Design -- Addendum:}",
  number		= "CSI--R9806",
  month			= "January",
  institution		= "Radboud University Nijmegen",
  organization		= "Radboud University Nijmegen",
  year			= "1998",
  code			= "icis.CSI-R9806",
  research_group	= "icis",
  class			= "Report"
}