@article{GDZPPN001164007, title = {Comparison theorems for supremum norms.}, journal = {Numerische Mathematik}, volume = {4}, year = {1962}, pages = {15-20}, zbl = {0103.33103}, url = {http://dml.mathdoc.fr/item/GDZPPN001164007} }
SCHNEIDER, H.; STRANG, W.G. Comparison theorems for supremum norms.. Numerische Mathematik, Tome 4 (1962) pp. 15-20. http://gdmltest.u-ga.fr/item/GDZPPN001164007/