@article {IOPORT.50313471,
    author       = {Bartels, S\"oren and Carstensen, Carsten},
    title        = {Each averaging technique yields reliable a posteriori error control in FEM on unstructured grids. Part II: Higher order FEM},
    year         = {2002},
    journal      = {Math. Comput.},
    volume       = {71},
    number       = {239},
    pages        = {971-994},
    doi          = {10.1090/S0025-5718-02-01412-6},
    identifier   = {50313471},
}