TY  - RPRT
TI  - Topical issues--a U.S. viewpoint.
AU  - R E Vlietstra
AU  - R L Frye
PY  - 1989
DO  - 10.1016/0167-5273(89)90242-8
UR  - https://pubmed.ncbi.nlm.nih.gov/2722283/
ID  - 2722283
ER  -