TY  - RPRT
TI  - Bäcklund transformations and nonlinear differential difference equations.
AU  - D Levi
AU  - R Benguria
PY  - 1980
DO  - 10.1073/pnas.77.9.5025
UR  - https://pubmed.ncbi.nlm.nih.gov/16592867/
ID  - 16592867
ER  -