by Kim, Sang Dong
Published in Calcolo (01.03.2009)

by Almansa, A., Ballester, C., Caselles, V., Haro, G.
Published in Journal of scientific computing (01.03.2008)

by Kunoth, Angela
Published in Numerical algorithms (01.07.2005)

by Batcho, Paul F., Karniadakis, George Em
Published in Journal of computational physics (01.11.1994)