@article{MZM_1974_15_5_a5,
     author = {B. A. Kats},
     title = {Convexity and star-shapedness of the level curves of polynomials},
     journal = {Matemati\v{c}eskie zametki},
     pages = {701--710},
     publisher = {mathdoc},
     volume = {15},
     number = {5},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1974_15_5_a5/}
}