2 citations to https://www.mathnet.ru/rus/tm569
  1. Isao Nakai, Handbook of Geometry and Topology of Singularities VI: Foliations, 2024, 201  crossref
  2. Yu. Ilyashenko, V. Moldavskis, “Total rigidity of generic quadratic vector fields”, Mosc. Math. J., 11:3 (2011), 521–530  mathnet  crossref  mathscinet