Ping-xing Sheng, “Hilbert's sixteenth problem and its generalization”, J. of Shanghai Univ., 5:2 (2001), 96
Rudolf Winkel, “A Transfer Principle in the Real Plane from Nonsingular Algebraic Curves to Polynomial Vector Fields”, Geometriae Dedicata, 79:1 (2000), 101
Steve Smale, “Mathematical problems for the next century”, Math Intelligencer, 20:2 (1998), 7
Rudolf Winkel, “An Exponential Formula for Polynomial Vector Fields”, Advances in Mathematics, 128:1 (1997), 190
Marcello Galeotti, “Monodromic unbounded polycycles”, Annali di Matematica, 171:1 (1996), 83
A. A. Davydov, L. Ortiz-Bobadilla, “Smooth normal forms of folded elementary singular points”, J Dyn Control Syst, 1:4 (1995), 463
A. I. Shtern, B. A. Efimov, S. Yu. Maslov, V. A. Dushskiǐ, P. I. Lizorkin, Yu. A. Bakhturin, I. Kh. Sabitov, A. N. Parshin, A. V. Prokhorov, I. O. Sarmanov, E. D. Solomentsev, V. V. Fedorchuk, V. V. Afanas'ev, E. G. Goluzina, G. V. Kuz'mina, V. V. Sazonov, I. V. Proskuryakov, A. V. Arkhangel'skiǐ, B. V. Khvedelidze, B. I. Golubov, S. A. Telyakovskiǐ, V. A. Chuyanov, V. E. Plisko, P. S. Modenov, A. B. Ivanov, A. S. Fedenko, V. L. Popov, E. M. Chirka, D. P. Zhelobenko, N. N. Vil'yams, A. V. Chernavskiǐ, O. A. Ivanova, G. A. Meshcheryakov, V. I. Pashkovskiǐ, D. D. Sokolov, E. A. Palyutin, M. Sh. Tsalenko, D. V. Anosov, V. A. Skvortsov, V. A. Eleev, L. D. Kudryavtsev, A. M. Nakhushev, V. M. Millionshchikov, A. P. Soldatov, V. V. Pospelov, E. V. Shikin, E. N. Kuz'min, D. B. Anosov, N. K. Nikol'skiǐ, E. G. Sklyarenko, D. O. Baladze, S. N. Malygin, L. A. Skornyakov, Yu. V. Prokhorov, A. L. Onishchik, L. A. Bokut', A. F. A, Encyclopaedia of Mathematics, 1995, 489
Н. Б. Медведева, “Асимптотика преобразования монодромии сложной монодромном особой точки”, Вестник ЧелГУ, 1994, № 2, 68–80
Massimo Villarini, “regularity properties of the period function near a center of a planar vector field”, Nonlinear Analysis: Theory, Methods & Applications, 19:8 (1992), 787
Ю. С. Ильяшенко, С. Ю. Яковенко, “Конечно-гладкие нормальные формы локальных семейств диффеоморфизмов и векторных полей.”, УМН, 46:1(277) (1991), 3–39 ; Yu. S. Ilyashenko, S. Yu. Yakovenko, “Finitely-smooth normal forms of local families of diffeomorphisms and vector fields”, Russian Math. Surveys, 46:1 (1991), 1–43