TY  - RPRT
TI  - A class of bounded pseudo-differential operators.
AU  - A P Calderón
AU  - R Vaillancourt
PY  - 1972
DO  - 10.1073/pnas.69.5.1185
UR  - https://pubmed.ncbi.nlm.nih.gov/16591985/
ID  - 16591985
ER  -