no. 1
Local H -1 Galerkin and adjoint local H -1 Galerkin procedures for elliptic equations
RAIRO. Analyse numérique, Tome 11 (1977) no. 1, pp. 3-12 
@article{M2AN_1977__11_1_3_0,
     author = {Douglas, Jim Jr. and Dupont, Todd and Rachford, Henry H. Jr. and Wheeler, Mary F.},
     title = {Local $H^{-1}$ {Galerkin} and adjoint local $H^{-1}$ {Galerkin} procedures for elliptic equations},
     journal = {RAIRO. Analyse num\'erique},
     pages = {3--12},
     year = {1977},
     publisher = {Centrale des revues, Dunod-Gauthier-Villars},
     address = {Montreuil},
     volume = {11},
     number = {1},
     mrnumber = {445860},
     zbl = {0362.65092},
     language = {en},
     url = {https://www.numdam.org/item/M2AN_1977__11_1_3_0/}
}
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%A Wheeler, Mary F.
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%J RAIRO. Analyse numérique
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%I Centrale des revues, Dunod-Gauthier-Villars
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%G en
%F M2AN_1977__11_1_3_0
Douglas, Jim Jr.; Dupont, Todd; Rachford, Henry H. Jr.; Wheeler, Mary F. Local $H^{-1}$ Galerkin and adjoint local $H^{-1}$ Galerkin procedures for elliptic equations. RAIRO. Analyse numérique, Tome 11 (1977) no. 1, pp. 3-12. https://www.numdam.org/item/M2AN_1977__11_1_3_0/

1. J. Descloux, On Finite Element Matrices, S.I.A.M. J. Numer. Anal., Vol. 9, 1972, pp. 260-265. | Zbl | MR

2. J. Jr Douglas, T. Dupont and L. Wahlbin, The stability in Lq of the L2-projection into finite element function spaces, Numer. Math., Vol.23, 1975, pp.193-197. | Zbl | MR

3. J.-L. Lions and E. Magenes, Non-Homogeneous Boundary Value Problems and Applications, Vol. I, Springer-Verlag, New York, 1972. | Zbl | MR