deletions | additions       diff --git a/introduction_1.tex b/introduction_1.tex  index b28f284..fc0260f 100644  --- a/introduction_1.tex  +++ b/introduction_1.tex 
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\cite{Barnes_Lumley_2011}  \cite{10.1016/j.pepi.2007.10.007} \cite{ontini_Cocchi_Carmisciano_2008}  \cite{}  \cite{}  \cite{}