È. S. Shpigelman, “The existence of regular solutions of a plane quadratic system”, Differ. Uravn., 15:10 (1979), 1835–1839
1975
2.
È. S. Shpigelman, “The boundedness of the infinitely continuable solutions of a system of two differential equations with quadratic right hand sides”, Differ. Uravn., 11:11 (1975), 2019–2026
1974
3.
È. S. Shpigelman, “The radius of attraction of a certain two-dimensional system”, Differ. Uravn., 10:3 (1974), 563–566
1972
4.
A. A. Levakov, È. S. Shpigelman, “The boundedness of infinitely continuable solutions of a system of two equations with quadratic right hand sides, and the set of characteristic Ljapunov exponents of the solutions of this system”, Differ. Uravn., 8:11 (1972), 1969–1976
1977
5.
È. S. Shpigelman, “Letter to the editors: “The boundedness of the infinitely continuable solutions of a system of two differential equations with quadratic right hand sides” (Differencial'nye Uravnenija 11 (1975), no. 11, 2019–2026)”, Differ. Uravn., 13:8 (1977), 1537