%0 Journal Article %A FAN, MING %T K-ENVELOPES FOR REAL INTERPOLATION METHODS %J Glasgow mathematical journal %D 2013 %P 293-307 %V 55 %N 2 %U http://geodesic.mathdoc.fr/articles/10.1017/S0017089512000523/ %R 10.1017/S0017089512000523 %F 10_1017_S0017089512000523