TY  - RPRT
TI  - The formulation and testing of models.
AU  - M BERMAN
PY  - 1963
DO  - 10.1111/j.1749-6632.1963.tb13373.x
UR  - https://pubmed.ncbi.nlm.nih.gov/13970929/
ID  - 13970929
ER  -