@article{NUMA_1993__65_4_133721,
     author = {Mark Ainsworth and J. Tinsley Oden},
     title = {A unified approach to a posteriori error estimation using element residual methods.},
     journal = {Numerische Mathematik},
     pages = {23--50},
     publisher = {mathdoc},
     volume = {65},
     number = {4},
     year = {1993},
     zbl = {0797.65080},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1993__65_4_133721/}
}