@article{TMF_2023_215_1_a4,
     author = {Jun Yan},
     title = {The~{\cyrs}igar soliton and {the~Ricci} flows perturbation solutions in the~two-dimensional string $\sigma$ model},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {97--110},
     publisher = {mathdoc},
     volume = {215},
     number = {1},
     year = {2023},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2023_215_1_a4/}
}