deletions | additions       diff --git a/bibliography/biblio.bib b/bibliography/biblio.bib  index 8156ade..5ee96a3 100644  --- a/bibliography/biblio.bib  +++ b/bibliography/biblio.bib 
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title = {{Punishment and reputation in spatial public goods games}},  journal = {Proceedings of the Royal Society B: Biological Sciences},  }  @article{Rand_2014,  doi = {10.1073/pnas.1400406111},  url = {http://dx.doi.org/10.1073/pnas.1400406111},  year = {2014},  month = {nov},  publisher = {Proceedings of the National Academy of Sciences},  volume = {111},  number = {48},  pages = {17093--17098},  author = {David G. Rand and Martin A. Nowak and James H. Fowler and Nicholas A. Christakis},  title = {{Static network structure can stabilize human cooperation}},  journal = {Proceedings of the National Academy of Sciences},  }