@InProceedings{HW07,
  Author         = {Martin Helfert and Christoph M. Wintersteiger},
  Title          = {Gustav Tauschek's Punchcard Accounting Machines},
  BookTitle      = {MEDICHI 2007 - Methodic and Didactic Challenges of the
                   History of Informatics},
  Editor         = {Laszlo B\"osz\"ormenyi},
  Volume         = {OCG 220},
  Pages          = {67--73},
  Publisher      = {Austrian Computer Society},
  year           = 2007
}