Spectral element method code writer question

hello,all
i was trying to compile a SPEM program for a bout 2 months.
the control equation of spem is second order elastic dynamic wave
equation--a hyperbolic type partial difference equation.
in my opinion, there is a lot of mathametica basic theory i can't
understand now,

the basic theory can be found on the archive: " The Spectral Element
method, an efficient tool to simulate the seismic response of 2D and 3D
geological structures"--BSSA, BY
i want to ask some help for the code just for 2d problem, just want to
have a sample code.

if you are working in this subject, could u give me a hand please.
thank you!

best wishes

LiNing

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