R Eymard, T Gallouet and R. Herbin
IMA Journal of Numerical Analysis 30 ( 4 ): 1009 - 1043 , 2010
N. Bouillard, R. Eymard, M. Henry, R. Herbin and D. Hilhorst
Nonlinear Analysis: Real World Applications 10 ( 2 ): 629 - 638 , 2009