@article{SM_2003_194_4_a1,
     author = {V. M. Kesel'man},
     title = {Isoperimetric inequality on conformally},
     journal = {Sbornik. Mathematics},
     pages = {495--513},
     year = {2003},
     volume = {194},
     number = {4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2003_194_4_a1/}
}