diff --git a/Lectures/L09_VerificationAndValidation/VerificAndValid.pdf b/Lectures/L09_VerificationAndValidation/VerificAndValid.pdf
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diff --git a/Lectures/L09_VerificationAndValidation/VerificAndValid.tex b/Lectures/L09_VerificationAndValidation/VerificAndValid.tex
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--- a/Lectures/L09_VerificationAndValidation/VerificAndValid.tex
+++ b/Lectures/L09_VerificationAndValidation/VerificAndValid.tex
@@ -43,6 +43,10 @@
 \frametitle{Verification and Validation}
 
 \bi
+\item TO DO - cite
+\href{https://ideas-productivity.org/assets/artifacts/hpcbp/hpcbp-083-gettingitright.pdf}
+{Cohen2024} presentation ``Getting it Right: System Testing of Scientific
+Software''
 \item Administrative details
 \item Questions?
 \item 741 workflow