TY  - RPRT
TI  - Level repulsion in integrable and almost-integrable quantum spin models.
AU  - TC Hsu
AU  - Anglès d'Auriac JC
PY  - 1993
DO  - 10.1103/physrevb.47.14291
UR  - https://pubmed.ncbi.nlm.nih.gov/10005774/
ID  - 10005774
ER  -