TY  - RPRT
TI  - DEGREE OF APPROXIMATION BY BOUNDED HARMONIC FUNCTIONS.
AU  - J L Walsh
PY  - 1960
DO  - 10.1073/pnas.46.10.1390
UR  - https://pubmed.ncbi.nlm.nih.gov/16590763/
ID  - 16590763
ER  -