@techreport{TeschlTeschl,
  author    = {Teschl, Gerald and Teschl, Susanne},
  title     = {Einf{\"u}hrung in Mathematica},
  subject      = {Mathematica},
  language  = {de}
}
@techreport{Teschl,
  author    = {Teschl, Susanne},
  title     = {MATLAB - Eine Einf{\"u}hrung, mit L{\"o}sungen},
  subject      = {Matlab},
  language  = {de}
}