TY  - RPRT
TI  - Mental rotation of three-dimensional objects.
AU  - R N Shepard
AU  - J Metzler
PY  - 1971
DO  - 10.1126/science.171.3972.701
UR  - https://pubmed.ncbi.nlm.nih.gov/5540314/
ID  - 5540314
ER  -