@article{JRAM_1997__483_153889,
     author = {N.J. Young and V.V. Peller},
     title = {Continuity properties of best analytic approximation.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {1--22},
     publisher = {mathdoc},
     volume = {483},
     year = {1997},
     zbl = {0890.47016},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1997__483_153889/}
}