@article{VMJ_2018_20_4_a1,
     author = {Vit. V. Volchkov and N. P. Volchkova},
     title = {Vector fields with zero flux through spheres of fixed radius},
     journal = {Vladikavkazskij matemati\v{c}eskij \v{z}urnal},
     pages = {20--34},
     year = {2018},
     volume = {20},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMJ_2018_20_4_a1/}
}