C. L. Chang
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The Trefftz method for the Helmholtz equation with degeneracy
Applied Numerical Mathematics
Optimal Error Estimate for the Div Least-squares Method with Data $f\inL^2$ and Application to Nonlinear Problems
SIAM Journal on Numerical Analysis
Pointwise Error Estimates for First-Order div Least-Squares Finite Element Methods and Applications to Superconvergence and A Posteriori Error Estimators