@article{TMF_2020_204_3_a4,
     author = {V. B. Matveev and A. O. Smirnov},
     title = {Multiphase solutions of nonlocal symmetric reductions of equations of {the~AKNS} hierarchy: {General} analysis and simplest examples},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {383--395},
     publisher = {mathdoc},
     volume = {204},
     number = {3},
     year = {2020},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2020_204_3_a4/}
}