@article{TIMM_2021_27_1_a15,
     author = {\`E. M. Muhamadiev and A. N. Naimov},
     title = {Criteria for the existence of periodic and bounded solutions of three-dimensional systems of differential equations},
     journal = {Trudy Instituta matematiki i mehaniki},
     pages = {157--172},
     publisher = {mathdoc},
     volume = {27},
     number = {1},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TIMM_2021_27_1_a15/}
}