no. 3
Interior and superconvergence estimates for mixed methods for second order elliptic problems
ESAIM: Modélisation mathématique et analyse numérique, Tome 19 (1985) no. 3, pp. 397-428 
@article{M2AN_1985__19_3_397_0,
     author = {J. Douglas, Jr. and Milner, F. A.},
     title = {Interior and superconvergence estimates for mixed methods for second order elliptic problems},
     journal = {ESAIM: Mod\'elisation math\'ematique et analyse num\'erique},
     pages = {397--428},
     year = {1985},
     publisher = {AFCET - Gauthier-Villars},
     address = {Paris},
     volume = {19},
     number = {3},
     mrnumber = {807324},
     zbl = {0613.65110},
     language = {en},
     url = {https://www.numdam.org/item/M2AN_1985__19_3_397_0/}
}
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J. Douglas, Jr.; Milner, F. A. Interior and superconvergence estimates for mixed methods for second order elliptic problems. ESAIM: Modélisation mathématique et analyse numérique, Tome 19 (1985) no. 3, pp. 397-428. https://www.numdam.org/item/M2AN_1985__19_3_397_0/

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