TY  - RPRT
TI  - The perception of transparent three-dimensional objects.
AU  - D Purves
AU  - T J Andrews
PY  - 1997
DO  - 10.1073/pnas.94.12.6517
UR  - https://pubmed.ncbi.nlm.nih.gov/9177250/
ID  - 9177250
ER  -