Why Finite Element Discretizations Can Be Factored by Triangular Hierarchical Matrices

@article{Bebendorf2007WhyFE,
  title={Why Finite Element Discretizations Can Be Factored by Triangular Hierarchical Matrices},
  author={Mario Bebendorf},
  journal={SIAM J. Numerical Analysis},
  year={2007},
  volume={45},
  pages={1472-1494}
}