[WP-18] S. Wang and N. A. Petersson, "Fourth order finite difference methods for the wave equation with mesh refinement interfaces," *SIAM J. Sci. Comput.*, (2018) [submitted]. LLNL-JRNL-757334

[PS-18] N. A. Petersson and B. Sjogreen, "High order accurate finite difference modeling of seismo-acoustic wave propagation in a moving atmosphere and a heterogeneous earth model coupled across a realistic topography," *J. Sci. Comput*., (2018) **74**, pp. 290–323, DOI:10.1007/s10915-017-0434-7. LLNL-JRNL-704612

[PODP-17] B. Prochnow, O. O’Reilly, E. M. Dunham, and N. A. Petersson, "Treatment of the polar coordinate singularity in axisymmetric wave propagation using high-order summation-by-parts operators on a staggered grid," *Comput. Fluids*, (2017) **149**, pp. 138–149, DOI:10.1016/j.compfluid.2017.03.015. LLNL-JRNL-698320

[POSB-16] N. A. Petersson, O. O’Reilly, B. Sjogreen, and S. Bydlon, “Discretizing singular point sources in hyperbolic wave propagation problems,” *J. Comput Phys.*, (2016) **321**, pp. 532–555*. *LLNL-JRNL-679293

[PS-15] N. A. Petersson and B. Sjogreen, "Wave propagation in anisotropic elastic materials and curvilinear coordinates using a summation-by-parts finite difference method,"* J. Comput Phys.*, (2015) **299**, pp. 820–841. LLNL-JRNL-663238

[PS-14] N. A. Petersson and B. Sjogreen, "Super-grid modeling of the elastic wave equation in semibounded domains," *Comm. Comput. Phys.*, (2014) **16**, pp. 913–955. LLNL-JRNL-610212

[SP-14] B. Sjogreen and N. A. Petersson, "Source estimation by full wave form inversion," *J. Sci. Comput.*, (2014) **59**(1), pp. 247–276, DOI: 10.1007/s10915-013-9760-6. LLNL-JRNL-573912

[AP-12] D. Appelo and N. A. Petersson, "A fourth-order accurate embedded boundary method for the wave equation," *SIAM J. Sci. Comput*., (2012) **50**, pp. A2982–A3008, DOI:10.1137/09077223X. LLNL-JRNL-417163

[SP-12a] B. Sjogreen, and N. A. Petersson, "A fourth order accurate finite difference scheme for the elastic wave equation in second order formulation," *J. Sci. Comput.,* **52**(1), pp. 17–48, DOI: 10.1007/s10915-011-9531-1, (2012). LLNL-JRNL-483427

[KP-12] H.-O. Kreiss, and N. A. Petersson, "Boundary estimates for the elastic wave equation in almost incompressible materials," *SIAM J. Numer. Anal.,* (2012) **50**, pp. 1556–1580, DOI:10.1137/110832847. LLNL-JRNL-482152

[PS-12] N. A. Petersson and B. Sjogreen, "Stable and efficient modeling of anelastic attenuation in seismic wave propagation," *Comm. Comput. Phys.*, (2012) **12**(1), pp. 193–225, DOI:10.4208. LLNL-JRNL-460239

[KOP-12] H. O. Kreiss, O. E. Ortiz, N. A. Petersson, "Initial-boundary value problems for second order systems of partial differential equations," *Mathematical Modelling and Numer. Anal.*, (2012) **46**(3), pp. 559–593, DOI:10.1051. LLNL-JRNL-416303

[PS-10] N. A. Petersson and B. Sjogreen, "Stable grid refinement and singular source discretization for seismic wave simulations," *Comm. Comput. Phys.*, (2010) **8**(5), pp. 1074–1110. LLNL-JRNL-419382

[PS-09] N. A. Petersson, B. Sjogreen, "An energy absorbing far-field boundary condition for the elastic wave equation," *Comm. Comput. Phys.,* (2009) **6**(3), pp. 483–508. LLNL-JRNL-405423

[AP-08] D. Appelo and N. A. Petersson, "A stable finite difference method for the elastic wave equation on complex geometries with free surfaces," *Comm. Comput. Phys.*, (2008) **5**, pp. 84–107.

[NPSK-07] S. Nilsson, N. A. Petersson, B. Sjogreen, H.-O. Kreiss, "Stable difference approximations for the elastic wave equation in second order formulation," *SIAM J. Numer. Anal.,* (2007) **45**, pp 1902–1936.

[KP-06b] H. O. Kreiss, N. A. Petersson, "An embedded boundary method for the wave equation with discontinuous coefficients," *SIAM J. Sci. Comput.,* (2006) **28**, pp. 2054–2074.

[KP-06] H. O. Kreiss, N. A. Petersson, "A second order accurate embedded boundary method for the wave equation with Dirichlet data," *SIAM J. Sci. Comput*., (2006) **27**, pp. 1141–1167.

[SP-05] B. Sjogreen, N. A. Petersson, "Perfectly matched layers for Maxwell's equations in second order formulation," *J. Comput Phys.*, (2005) **209**, pp. 19–46.

[KPY-04] H. O. Kreiss, N. A. Petersson, and J. Ystrom, "Difference approximations of the Neumann problem for the second order wave equation," *SIAM J. Numer. Anal.,* (2004) **42**, pp. 1292–1323.

[KPY-02] H. O. Kreiss, N. A. Petersson, and J. Ystrom, "Difference approximations for the second order wave equation," *SIAM J. Numer. Anal., *(2002) **40**, pp. 1940–1967.