@article{RM_2010_65_4_a6,
     author = {V. N. Karpushkin},
     title = {The number of connected components of~a~level surface of a~harmonic polynomial},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {783--784},
     publisher = {mathdoc},
     volume = {65},
     number = {4},
     year = {2010},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_2010_65_4_a6/}
}