@article{ea292a9fa21140b7bd55bfd5b90dc523,
title = "Local ultraconvergence of finite element methods for second-order elliptic problems with singularity",
keywords = "discrete Green\&apos, s function, Richardson extrapolation technique, the local symmetric technique, ultraconvergence",
author = "Wenming He and Ren Zhao and Guanrong Li and Wulan Li",
year = "2021",
month = may,
doi = "10.1002/num.22668",
language = "English",
volume = "37",
pages = "2132--2149",
journal = "Numerical Methods for Partial Differential Equations",
issn = "0749-159X",
number = "3",
}