@article{MT_2017_20_2_a5,
     author = {E. D. Rodionov and V. V. Slavskiǐ},
     title = {Polar transform of conformally flat metrics},
     journal = {Matemati\v{c}eskie trudy},
     pages = {120--138},
     publisher = {mathdoc},
     volume = {20},
     number = {2},
     year = {2017},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MT_2017_20_2_a5/}
}