TY  - RPRT
TI  - Singular integrals related to the Radon transform and boundary value problems.
AU  - D H Phong
AU  - E M Stein
PY  - 1983
DO  - 10.1073/pnas.80.24.7697
UR  - https://pubmed.ncbi.nlm.nih.gov/16593402/
ID  - 16593402
ER  -