deletions | additions       diff --git a/section_Introduction_Define_open_source__.tex b/section_Introduction_Define_open_source__.tex  index 0f30b48..8b8b4dc 100644  --- a/section_Introduction_Define_open_source__.tex  +++ b/section_Introduction_Define_open_source__.tex 
...
Define open source  Reference recent commentary \cite{Gezelter_2015}\cite{Krylov_2015} \cite{Karthikeyan_2014}\cite{Gezelter_2015}\cite{Krylov_2015}  Advantages   Free  Not a black box