TY  - RPRT
TI  - Mental representation of three-dimensional objects in visual problem solving and recognition.
AU  - L A Cooper
PY  - 1990
DO  - 10.1037//0278-7393.16.6.1097
UR  - https://pubmed.ncbi.nlm.nih.gov/2148582/
ID  - 2148582
ER  -