Stephan__Dahlke
Adaptive wavelet methods for saddle point problems
Besov regularity for elliptic boundary value problems
Biorthogonal wavelets and multigrid
Nonlinear approximation and adaptive techniques for solving elliptic equations, in: Multiscale Techniques for PDEs
Stable multiscale bases and local error estimation for elliptic problems
Wavelet bases adapted to pseudo-differential operators