update

ref.bib

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+@article{Hemberger_2013,
+   title={Dynamical excision boundaries in spectral evolutions of binary black hole spacetimes},
+   volume={30},
+   ISSN={1361-6382},
+   url={http://dx.doi.org/10.1088/0264-9381/30/11/115001},
+   DOI={10.1088/0264-9381/30/11/115001},
+   number={11},
+   journal={Classical and Quantum Gravity},
+   publisher={IOP Publishing},
+   author={Hemberger, Daniel A and Scheel, Mark A and Kidder, Lawrence E and Szilágyi, Béla and Lovelace, Geoffrey and Taylor, Nicholas W and Teukolsky, Saul A},
+   year={2013},
+   month=apr, pages={115001} }
+
+@article{Hannam_2008,
+   title={Wormholes and trumpets: Schwarzschild spacetime for the moving-puncture generation},
+   volume={78},
+   ISSN={1550-2368},
+   url={http://dx.doi.org/10.1103/PhysRevD.78.064020},
+   DOI={10.1103/physrevd.78.064020},
+   number={6},
+   journal={Physical Review D},
+   publisher={American Physical Society (APS)},
+   author={Hannam, Mark and Husa, Sascha and Ohme, Frank and Brügmann, Bernd and Ó Murchadha, Niall},
+   year={2008},
+   month=sep }