@article{NUMA_1987__55_4_133361,
     author = {Junping Wang},
     title = {Asymptotic {Expansions} and {L...-Error} {Estimates} for {Mixed} {Finite} {Element} {Methods} for {Second} {Order} {Elliptic} {Problems.}},
     journal = {Numerische Mathematik},
     pages = {401--430},
     publisher = {mathdoc},
     volume = {55},
     number = {4},
     year = {1987},
     zbl = {0676.65109},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1987__55_4_133361/}
}