@article{TM_1998_221_a5,
     author = {R. I. Bogdanov},
     title = {Multiplicative {Theory} of {Orbital} {Equivalence} of {Vector} {Fields} in the {Plane}},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {101--126},
     publisher = {mathdoc},
     volume = {221},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1998_221_a5/}
}