J. Gay et al., SURFACIC ELEMENT OF CURRENTS ABLE TO TREA T PUNCTUAL CONTACTS, Comptes rendus de l'Academie des sciences. Serie 1, Mathematique, 317(9), 1993, pp. 895-898
A basic function with non-zero flux through a node, is added to the cl
assical element. This is convenient for links hires-surfaces. The spac
e built is a conforming approximation.