@article{SIGMA_2008_4_a6,
     author = {Teunis C. Dorlas and Wolodymyr I. Skrypnik},
     title = {Three {Order} {Parameters} in {Quantum} {XZ} {Spin-Oscillator} {Models} with {Gibbsian} {Ground} {States}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2008},
     volume = {4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2008_4_a6/}
}