deletions | additions       diff --git a/bibliography/biblio.bib b/bibliography/biblio.bib  index 25a9f84..cc6f7fd 100644  --- a/bibliography/biblio.bib  +++ b/bibliography/biblio.bib 
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title = {{New features of the Franck-Hertz experiment}},  journal = {Am. J. Phys.},  }  @article{Morrison_2008,  url = {http://web.mit.edu/sdmorr/Public/8.13/franck-hertz-paper.pdf},  year={2008},  pages = {4}  author = {Scott D Morrision}  title = {{The Franck-Hertz Experiment: Inelastic Collisions in Mercury Gas}}