Local $H^{-1}$ Galerkin and adjoint local $H^{-1}$ Galerkin procedures for elliptic equationsJim Jr. Douglas, Todd Dupont, Henry H. Jr. Rachford and Mary F. WheelerRAIRO. Anal. numér., 11 1 (1977) 3-12DOI: https://doi.org/10.1051/m2an/1977110100031