TY  - RPRT
TI  - Perceptual puzzle.
AU  - James Bradley Summers
AU  - Joseph Kaminski
PY  - 2003
DO  - 10.1016/s1076-6332(03)80127-7
UR  - https://pubmed.ncbi.nlm.nih.gov/12862291/
ID  - 12862291
ER  -