@book{Schmitz2011,
  author    = {Schmitz, G{\"u}nter},
  title     = {Elektrotechnik : Grundlagen der Elektrotechnik f{\"u}r Ingenieur-Studenten},
  publisher = {Ventus Publ.},
  address   = {Frederiksberg},
  isbn      = {978-87-7681-786-2},
  pages     = {142 S. Ill., graph. Darst},
  year      = {2011},
  language  = {de}
}
@book{Schmitz2011,
  author    = {Schmitz, G{\"u}nter},
  title     = {Elektronik : Grundlagen der Elektronik f{\"u}r Ingenieurstudenten},
  publisher = {Ventus Publ.},
  address   = {Frederiksberg},
  isbn      = {978-87-7681-832-6},
  pages     = {164 S. : Ill., graph. Darst.},
  year      = {2011},
  language  = {de}
}