@incollection{UBHD-68103296,
  author={Eckart, Wolfgang U. and H{\"u}bner, Klaus and Nawa, Christine},
  title={Aufschwung  der Naturwissenschaften},
  subtitle={Bunsen, Kirchhoff  und Helmholtz},
  year={2011},
  pages={96-99},
  language={ger},
  isbn={978-3-9811463-4-9 and 978-3-9811463-3-2},
  booktitle={Wissenschaftsatlas der Universit{\"a}t Heidelberg},
  editor={Meusburger, Peter and Schuch, Thomas},
}
@incollection{UBHD-68103295,
  author={Eckart, Wolfgang U. and H{\"u}bner, Klaus and Nawa, Christine},
  title={The rise of the natural sciences},
  subtitle={Bunsen, Kirchoff, and Helmholtz},
  year={2012},
  pages={96-99},
  language={eng},
  isbn={978-3-9811463-4-9},
  booktitle={Wissenschaftsatlas of Heidelberg University},
  editor={Meusburger, Peter},
}