deletions | additions       diff --git a/bibliography/biblio.bib b/bibliography/biblio.bib  index e69de29..e00f128 100644  --- a/bibliography/biblio.bib  +++ b/bibliography/biblio.bib 
...
@article{koopman1997write,  title={How to write an abstract},  author={Koopman, Philip},  journal={Carnegie Mellon University. Retrieved May},  volume={31},  pages={2013},  year={1997}  }  @article{ashby2000write,  title={How to write a paper},  author={Ashby, Mike},  journal={Engineering Department, University of Cambridge, Version},  volume={5},  pages={38},  year={2000}  }  @book{de2011engineering,  title={Engineering systems: Meeting human needs in a complex technological world},  author={De Weck, Olivier L and Roos, Daniel and Magee, Christopher L},  year={2011},  publisher={MIT Press}  }