TY  - RPRT
TI  - Plastic spheres in clip-on frames.
AU  - C BERENS
AU  - B E TAYLOR
PY  - 1957
DO  - 10.1016/0002-9394(57)92781-2
UR  - https://pubmed.ncbi.nlm.nih.gov/13458315/
ID  - 13458315
ER  -