@article{VMUMM_1988_3_a10,
     author = {A. A. Roǐtvarf},
     title = {A two-valued velocity field with a root singularity},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {41--44},
     publisher = {mathdoc},
     number = {3},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1988_3_a10/}
}