A Galerkin procedure for approximating the flux on the boundary for elliptic and parabolic boundary value problemsJim Jr. Douglas, Todd Dupont and Mary Fanett WheelerR.A.I.R.O. Analyse Numérique, 8 R2 (1974) 47-59DOI: https://doi.org/10.1051/m2an/197408R200471
