Superconvergence of mixed finite element methods for parabolic equations
ESAIM: Modélisation mathématique et analyse numérique, Tome 21 (1987) no. 2, pp. 327-352. 
@article{M2AN_1987__21_2_327_0,
     author = {Cristina, Maria and Squeff, J.},
     title = {Superconvergence of mixed finite element methods for parabolic equations},
     journal = {ESAIM: Mod\'elisation math\'ematique et analyse num\'erique},
     pages = {327--352},
     publisher = {AFCET - Gauthier-Villars},
     address = {Paris},
     volume = {21},
     number = {2},
     year = {1987},
     mrnumber = {896246},
     zbl = {0621.65116},
     language = {en},
     url = {http://archive.numdam.org/item/M2AN_1987__21_2_327_0/}
}
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Cristina, Maria; Squeff, J. Superconvergence of mixed finite element methods for parabolic equations. ESAIM: Modélisation mathématique et analyse numérique, Tome 21 (1987) no. 2, pp. 327-352. http://archive.numdam.org/item/M2AN_1987__21_2_327_0/

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