TY  - RPRT
TI  - Children's building bricks for three-dimensional illustrations.
AU  - R Sunderland
PY  - 1980
DO  - 10.1016/s0140-6736(80)90211-1
UR  - https://pubmed.ncbi.nlm.nih.gov/6107534/
ID  - 6107534
ER  -