Fixing bibtex citation

[vkresch]

Reference to a related issue in the repository

Resolves #100.

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Correcting the bibtex citation in the documentation. The new change will be seen tomorrow when the next cron job will be executed.

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@jdsika @PhRosenberger pls check and merge.

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• My code and comments follow the style guidelines and contributors guidelines of this project.
• I have performed a self-review of my own code.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests / travis ci pass locally with my changes.