deletions | additions       diff --git a/bibliography/biblio.bib b/bibliography/biblio.bib  index 5539f15..e27ea9a 100644  --- a/bibliography/biblio.bib  +++ b/bibliography/biblio.bib 
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@article{undefined,  title = {{Quantitative seismology}}, {{Laser ultrasonics techniques and applications}},  author = {Aki, Keiiti {Scruby, Christopher B  and Richards, Paul G}, Drain, Leslie E},  year = {2002}, {1990},  publisher = {CRC Press},  }