@article{NUMA_1977__29_132525,
     author = {F. Stenger},
     title = {Optimal {Convergence} of {Minimum} {Norm} {Approximations} in {Hp.}},
     journal = {Numerische Mathematik},
     pages = {345--362},
     publisher = {mathdoc},
     volume = {29},
     year = {1977},
     zbl = {0437.41030},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1977__29_132525/}
}