@Book{            Lehner_1990aa,
  author        = {Lehner, Günther},
  booktitle     = {Elektromagnetische Feldtheorie för Ingenieure und Physiker},
  langid        = {german},
  publisher     = {Springer},
  title         = {Elektromagnetische Feldtheorie für Ingenieure und Physiker},
  year          = {1990}
}

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