@article{ZNSL_2007_347_a7,
     author = {E. Sh. Gutshabash},
     title = {On canonical variables for integrable models of magnets},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {117--143},
     publisher = {mathdoc},
     volume = {347},
     year = {2007},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2007_347_a7/}
}