deletions | additions       diff --git a/introduction_1.tex b/introduction_1.tex  index 8a37c77..b28f284 100644  --- a/introduction_1.tex  +++ b/introduction_1.tex 
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\cite{macho_Fernandez_Gottsmann_2011}  \cite{Beiki_2010}  \cite{Barnes_Lumley_2011}  \cite{} \cite{10.1016/j.pepi.2007.10.007}  \cite{}  \cite{}  \cite{}