@article{GDZPPN001172689, title = {Regular Splittings and the Discrete Neumann Problem.}, journal = {Numerische Mathematik}, volume = {25}, year = {1975}, pages = {153-162}, zbl = {0319.65028}, url = {http://dml.mathdoc.fr/item/GDZPPN001172689} }
Plemmons, R.J. Regular Splittings and the Discrete Neumann Problem.. Numerische Mathematik, Tome 25 (1975) pp. 153-162. http://gdmltest.u-ga.fr/item/GDZPPN001172689/