TY  - RPRT
TI  - Completely Integrable Partial Differential Equations in Normed Linear Spaces.
AU  - A D Michal
PY  - 1953
DO  - 10.1073/pnas.39.10.1089
UR  - https://pubmed.ncbi.nlm.nih.gov/16589379/
ID  - 16589379
ER  -