TY  - RPRT
TI  - Further increase in ultraviolet B.
AU  - W Ambach
AU  - M Blumthaler
PY  - 1991
DO  - 10.1016/0140-6736(91)90536-x
UR  - https://pubmed.ncbi.nlm.nih.gov/1677737/
ID  - 1677737
ER  -