@article{NUMA_1991__60_4_133602,
     author = {W. Dahmen and R.A. DeVore and ...},
     title = {On monotone extensions of boundary data.},
     journal = {Numerische Mathematik},
     pages = {477--492},
     publisher = {mathdoc},
     volume = {60},
     number = {4},
     year = {1991},
     zbl = {0753.65011},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1991__60_4_133602/}
}