文献

upsampling methods for nonuniform-grid modeling:
Moczo, 1989 Finite-difference technique for SH-wave in 2-D media using
irregular grids-application to the seismic response problem. Geophys. J. Int.,
99(2), 321-329. https://doi.org/10.1111/j.1365-246X.1989.tb01691.x
Jastram and Behle, 1992
Falk et al., 1998
Tessmer, 2000;
Oliveira, 2003;
Zhao HB and Wang XM, 2008
Song GJ et al., 2010
Chu CL and Stoffa, 2012
Zhang ZG et al., 2013
Huang C and Dong LG, 2009