Carsten Carstensen
Reliable and efficient averaging techniques as universal tool for a posteriori finite element error control on unstructured grids.
Int. J. Numer. Anal. Mod., 3 (2006), pp. 333-347. Abstract
Braess D, Carstensen C, Hoppe RHW
Convergence analysis of a conforming adaptive finite element method for an obstacle problem
NUMERISCHE MATHEMATIK, 107, 3(2007), pp. 455-471
Asymptotic expansions and Richardson extrapolation of approximate solutions for second order elliptic problems on rectangular domains by mixed finite element methods
SIAM J NUMER ANAL, 44, 3(2006), pp. 1122-1149