deletions | additions       diff --git a/bibliography/biblio.bib b/bibliography/biblio.bib  index 7b670bf..f948f2e 100644  --- a/bibliography/biblio.bib  +++ b/bibliography/biblio.bib 
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year = {2015},  publisher = {Elsevier},  }  @article{davidson1990approach,  title = {{Approach-withdrawal and cerebral asymmetry: Emotional expression and brain physiology: I.}},  author = {Davidson, Richard J and Ekman, Paul and Saron, Clifford D and Senulis, Joseph A and Friesen, Wallace V},  journal = {Journal of personality and social psychology},  volume = {58},  number = {2},  pages = {330},  year = {1990},  publisher = {American Psychological Association},  }