TY  - RPRT
TI  - Production frontier analyses: comments on the methodology.
AU  - J Grytten
PY  - 2000
DO  - 10.1034/j.1600-0528.2000.028002081.x
UR  - https://pubmed.ncbi.nlm.nih.gov/10730714/
ID  - 10730714
ER  -