@article{ZNSL_1990_185_a9,
     author = {A. Yu. Solinin},
     title = {The continuous symmetrization of a sets},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {125--139},
     publisher = {mathdoc},
     volume = {185},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1990_185_a9/}
}