TY  - RPRT
TI  - Concept conservation under positively and negatively evaluated transformations.
AU  - E Saltz
AU  - H Hamilton
PY  - 1968
DO  - 10.1016/0022-0965(68)90070-2
UR  - https://pubmed.ncbi.nlm.nih.gov/5642133/
ID  - 5642133
ER  -