TY  - RPRT
TI  - Conceptualization for planning and evaluation.
AU  - W M Trochim
AU  - R Linton
PY  - 1986
DO  - 10.1016/0149-7189(86)90044-3
UR  - https://pubmed.ncbi.nlm.nih.gov/10301179/
ID  - 10301179
ER  -