@article{ZNSL_1990_185_a6,
     author = {G. V. Kuz'mina},
     title = {On the problem of the extremal decomposition of the {Riemann} sphere},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {72--95},
     publisher = {mathdoc},
     volume = {185},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1990_185_a6/}
}