TY  - RPRT
TI  - Phelps' technical progress model generalized.
AU  - G Steinmann
AU  - J L Simon
PY  - 1980
DO  - 10.1016/0165-1765(80)90095-6
UR  - https://pubmed.ncbi.nlm.nih.gov/12312014/
ID  - 12312014
ER  -