TY  - RPRT
TI  - Expandable rings. A new solution to an old problem.
AU  - G E Giddins
PY  - 1997
DO  - 10.1016/s0266-7681(97)80349-x
UR  - https://pubmed.ncbi.nlm.nih.gov/9752907/
ID  - 9752907
ER  -