no. R2
A Galerkin procedure for approximating the flux on the boundary for elliptic and parabolic boundary value problems
Revue française d'automatique, informatique, recherche opérationnelle. Analyse numérique, Tome 8 (1974) no. R2, pp. 47-59. 
@article{M2AN_1974__8_2_47_0,
     author = {Douglas, Jim Jr. and Dupont, Todd and Wheeler, Mary Fanett},
     title = {A {Galerkin} procedure for approximating the flux on the boundary for elliptic and parabolic boundary value problems},
     journal = {Revue fran\c{c}aise d'automatique, informatique, recherche op\'erationnelle. Analyse num\'erique},
     pages = {47--59},
     publisher = {Dunod},
     address = {Paris},
     volume = {8},
     number = {R2},
     year = {1974},
     mrnumber = {359357},
     zbl = {0315.65063},
     language = {en},
     url = {http://www.numdam.org/item/M2AN_1974__8_2_47_0/}
}
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Douglas, Jim Jr.; Dupont, Todd; Wheeler, Mary Fanett. A Galerkin procedure for approximating the flux on the boundary for elliptic and parabolic boundary value problems. Revue française d'automatique, informatique, recherche opérationnelle. Analyse numérique, Tome 8 (1974) no. R2, pp. 47-59. http://www.numdam.org/item/M2AN_1974__8_2_47_0/

[1] J. Douglas Jr., T. Dupont and L. Wahlbin, Optimal L ∞ error estimates for Galerkin approximations to solutions of two point boundary value problems, to appear in Math. Comp., Oct. 1974. | Zbl

[2] J. Douglas Jr., T. Dupont and M. F. Wheeler, A quasi-projection approximation method applied to Galerkin procedures for parabolic and hyperbolic equations, to appear

[3] T. Dupont, Some L 2 error estimates for parabolic Galerkin methods, Mathematical Foundations of the Finite Element Method with Applications to Partial Differential Equations, A. K. Azis (ed.), Academic Press, New York, 1972. | MR | Zbl

[4] J.-L. Lions and E. Magenes, Problèmes aux limites non homogènes et applications, Vol. 1, Dunod, Paris, 1968. | MR | Zbl

[5] J. A. Wheeler, Simulation of heat transfer from a warm pipeline buried in permafrost, presented to the 74th National Meeting of the American Institute of Chemical Engineers, New Orleans, March 1973.

[6] M. F. Wheeler, An optimal L ∞ error estimate for Galerkin approximations to solutions of two point boundary problems, SIAM, J. Numer. Anal., 10 (1973), 914-917. | MR | Zbl