%0 Journal Article %A E. D. Zhitelzeif %T Limit cycles of a system of relay type with polynomial right-hand side %J Differencialʹnye uravneniâ %D 1977 %P 753-755 %V 13 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1977_13_4_a22/ %G ru %F DE_1977_13_4_a22