L. V. Detchenya, A. P. Sadovskii, “Letter to the editors: “Orbital normal forms of two-dimensional analytic systems with zero linear and nonzero quadratic parts” [Differ. Uravn. <b>35</b> (1999), no. 1, 51–57, 141; MR1723202]”, Differ. Uravn., 2000, Volume 36, Number 11,Page 1580

Letters to the Editor

Letter to the editors: “Orbital normal forms of two-dimensional analytic systems with zero linear and nonzero quadratic parts” [Differ. Uravn. 35 (1999), no. 1, 51–57, 141; MR1723202]

L. V. Detchenya, A. P. Sadovskii