deletions | additions       diff --git a/bibliography/biblio.bib b/bibliography/biblio.bib  index 993827f..854fed4 100644  --- a/bibliography/biblio.bib  +++ b/bibliography/biblio.bib 
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title = {{``Elastic scattering,'' in \textit{Springer Handbook of Atomic, Molecular, and Optical Physics}, edited by G. W. F. Drake (Springer-Verlag)}},  year = {2006},  isbn = {978-0-387-20802-2},  url = {{{http://www.springer.com/us/book/9780387208022}}}}, {{{{http://www.springer.com/us/book/9780387208022}}}}},  } 
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}  @article{Rapior_2006,  doi = {10.1119/1.2174033},  url = {http://dx.doi.org/10.1119/1.2174033},  year = {2006},  publisher = {American Association of Physics Teachers ({AAPT})},  volume = {74},  number = {5},  pages = {423},  author = {Gerald Rapior and Klaus Sengstock and Valery Baev},  title = {{New features of the Franck-Hertz experiment}},  journal = {Am. J. Phys.},  }