TY  - RPRT
TI  - Why is the Upsilon (3S) different?
AU  - HJ Lipkin
AU  - SF Tuan
PY  - 1989
DO  - 10.1103/physrevlett.62.2910
UR  - https://pubmed.ncbi.nlm.nih.gov/10040125/
ID  - 10040125
ER  -