@article{ZNSL_2018_473_a4,
     author = {N. Bogoliubov and C. Malyshev},
     title = {The partition function of the four-vertex model in a special external field},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {77--84},
     publisher = {mathdoc},
     volume = {473},
     year = {2018},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2018_473_a4/}
}