TY  - RPRT
TI  - REGULARITY THEOREMS FOR SOLUTIONS OF PARTIAL DIFFERENTIAL EQUATIONS WITH VARIABLE COEFFICIENTS.
AU  - F E Browder
PY  - 1957
DO  - 10.1073/pnas.43.2.234
UR  - https://pubmed.ncbi.nlm.nih.gov/16590004/
ID  - 16590004
ER  -