TY  - RPRT
TI  - Mixed rules in concept learning.
AU  - R C Haygood
AU  - J S Miller
PY  - 1969
DO  - 10.2466/pr0.1969.25.2.423
UR  - https://pubmed.ncbi.nlm.nih.gov/5367127/
ID  - 5367127
ER  -