TY  - RPRT
TI  - Quantum fluctuations in the two-dimensional XY model: Variational approach.
AU  - D Ariosa
AU  - H Beck
PY  - 1992
DO  - 10.1103/physrevb.45.819
UR  - https://pubmed.ncbi.nlm.nih.gov/10001124/
ID  - 10001124
ER  -