@article{NUMA_1992__63_1_133691,
     author = {R.D. Lazarov and A.I. Pehlivanov and ...},
     title = {Superconvergence analysis of approximate boundary-flux calculations.},
     journal = {Numerische Mathematik},
     pages = {483--502},
     publisher = {mathdoc},
     volume = {63},
     number = {1},
     year = {1992},
     zbl = {0797.65079},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1992__63_1_133691/}
}