More synchrotron citations

refs.bib

@@ -344,3 +344,14 @@ ISSN={0003-6951},}
   pages={85060K},
   year={2012}
 }
+
+@article{hudspeth2013high,
+  title={High speed synchrotron x-ray phase contrast imaging of dynamic material response to split Hopkinson bar loading},
+  author={Hudspeth, M and Claus, B and Dubelman, S and Black, J and Mondal, A and Parab, N and Funnell, C and Hai, F and Qi, ML and Fezzaa, K and others},
+  journal={Review of Scientific Instruments},
+  volume={84},
+  number={2},
+  pages={025102},
+  year={2013},
+  publisher={AIP Publishing}
+}