TY  - RPRT
TI  - WAVE BRANCHING PROCESSES AND INVARIANT IMBEDDING, I.
AU  - R Bellman
AU  - R Kalaba
PY  - 1961
DO  - 10.1073/pnas.47.9.1507
UR  - https://pubmed.ncbi.nlm.nih.gov/16590885/
ID  - 16590885
ER  -