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 #### Some references ####
 
 - Discretizing the wave equation: https://hplgit.github.io/fdm-book/doc/pub/wave/pdf/wave-4print.pdf
-- Boundary condition: https://hal.archives-ouvertes.fr/hal-01374183
+- Absorbing oundary conditions: https://hal.archives-ouvertes.fr/hal-01374183
 - Cloaking device: https://www.sciencedirect.com/science/article/pii/S0165212514001759