TY  - RPRT
TI  - A SEMIGRAPHICAL METHOD FOR THE ANALYSIS OF COMPLEX PROBLEMS.
AU  - E Anderson
PY  - 1957
DO  - 10.1073/pnas.43.10.923
UR  - https://pubmed.ncbi.nlm.nih.gov/16590110/
ID  - 16590110
ER  -