@misc{IVP_2023_31_3_a1,
     title = {40 years of {Ilya} {V.} {Sysoev}},
     journal = {Izvestiya VUZ. Applied Nonlinear Dynamics},
     pages = {249--253},
     publisher = {mathdoc},
     volume = {31},
     number = {3},
     year = {2023},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVP_2023_31_3_a1/}
}