@article{ETNA_2004__17__a0,
     author = {Gatica,  Gabriel N.},
     title = {A note on the efficiency of residual-based a posteriori error estimators for some mixed finite element methods.},
     journal = {Electronic transactions on numerical analysis},
     pages = {218--233},
     year = {2004},
     volume = {17},
     zbl = {1065.65125},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ETNA_2004__17__a0/}
}