@article{VUU_2022_32_1_a0,
     author = {N. P. Volchkova and Vit. V. Volchkov},
     title = {Vector fields with zero flux through circles of fixed radius on $ \mathbb{H}^2$},
     journal = {Vestnik Udmurtskogo universiteta. Matematika, mehanika, kompʹ\^uternye nauki},
     pages = {3--17},
     publisher = {mathdoc},
     volume = {32},
     number = {1},
     year = {2022},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VUU_2022_32_1_a0/}
}