@article{GDZPPN00118542X, title = {On monotone extensions of boundary data.}, journal = {Numerische Mathematik}, volume = {59}, year = {1991}, pages = {477-492}, zbl = {0753.65011}, url = {http://dml.mathdoc.fr/item/GDZPPN00118542X} }
Dahmen, W.; DeVore, R.A.; ... On monotone extensions of boundary data.. Numerische Mathematik, Tome 59 (1991) pp. 477-492. http://gdmltest.u-ga.fr/item/GDZPPN00118542X/