TY  - RPRT
TI  - Extrapolation through hierarchical levels.
AU  - H A De Kruijf
PY  - 1991
DO  - 10.1016/0742-8413(91)90171-o
UR  - https://pubmed.ncbi.nlm.nih.gov/1677865/
ID  - 1677865
ER  -