Edwin Quashie added missing citations to bibliography  almost 9 years ago

Commit id: 0c005fec501052f6fcf5d0136c87882328fc2745

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title = {{Einführung in die Quantenchemie. Von H. Hellmann. 350 S.,43 Abb. 35 Tab. Franz Deuticke, Leipzig u. Wien 1937. Pr. geh. {RM}. 20,-. geb. {RM}. 22,-}},  journal = {Angewandte Chemie},  }  @incollection{Hellmann_2015,  doi = {10.1007/978-3-662-45967-6_2},  url = {http://dx.doi.org/10.1007/978-3-662-45967-6_2},  year = {2015},  publisher = {Springer Science $\mathplus$ Business Media},  pages = {19--376},  author = {Hans Hellmann},  title = {{Einführung in die Quantenchemie}},  booktitle = {Hans Hellmann: Einführung in die Quantenchemie},  }