deletions | additions       diff --git a/introduction_1.tex b/introduction_1.tex  index 0a1e824..dceb7d3 100644  --- a/introduction_1.tex  +++ b/introduction_1.tex 
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\cite{erez-Flores_Gomez-Trevino_2005}  \cite{http://adsabs.harvard.edu/abs/2003Geop...68..949G} \cite{2003Geop...68..949G}  \cite{}