@article{ZNSL_2015_437_a1,
     author = {N. M. Bogoliubov and C. Malyshev},
     title = {Combinatorial aspects of correlation functions of the $XXZ$ {Heisenberg} chain in limiting cases},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {15--34},
     publisher = {mathdoc},
     volume = {437},
     year = {2015},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2015_437_a1/}
}