TY  - RPRT
TI  - Nonlinear wave equations and constrained harmonic motion.
AU  - P Deift
AU  - F Lund
AU  - E Trubowitz
PY  - 1980
DO  - 10.1073/pnas.77.2.716
UR  - https://pubmed.ncbi.nlm.nih.gov/16592777/
ID  - 16592777
ER  -