fix: added a citation

1 files changed, 1 insertions, 1 deletions

diff --git a/main.tex b/main.tex
index 2f2c2ef..6cc066b 100644
--- a/main.tex
+++ b/main.tex
@@ -122,7 +122,7 @@
 	\begin{minipage}[b]{0.45\linewidth}
 		\begin{tcolorbox}[title=Problem, colbacktitle=red!70!black,colback=red!20!white]
 			We cannot just go and test digital twins on large systems, because we do not have large systems at hand.
-			Moreover, real-world experimentation is costly and unsustainable in the long run.
+                        Moreover, real-world experimentation is costly and unsustainable in the long run~\cite{DBLP:conf/ccgrid/MastenbroekAJLB21}.
 		\end{tcolorbox}
 		\vspace{0.5cm}
 		\begin{tcolorbox}[title=Solution, colbacktitle=Green!70!black, colback=Green!20!white]