@article{ZNSL_2002_291_a11,
     author = {K. L. Malyshev},
     title = {Functional integration and correlators of $z$-components of local spins in the {XY} and {XX} {Heisenberg} magnets},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {206--227},
     publisher = {mathdoc},
     volume = {291},
     year = {2002},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2002_291_a11/}
}