1
Jiang Q, Llibre J. Qualitative Classification of Singular Points[J]. Qualitative Theory of Dynamical Systems, 2005, 6(1): 87-168.
2
Enciso A, Peraltasalas D. Critical points of Green\u0027s functions on complete manifolds[J]. Journal of Differential Geometry, 2010, 92(1): 1-29.
3
Marek Izydorek · Slawomir Rybicki · Zbigniew Szafraniec. A note on the Poincaré-Bendixson index theorem. 1996.
4
Schecter S, Singer M F. Singular points of planar vector fields[C]., 1980: 393-409.
5
Sverdlove R. Critical points with asymmetric schemes[J]. Journal of Mathematical Analysis and Applications, 1982, 88(2): 452-463.
6
Stephen Schecter · Michael F Singer. Erratum to: Separatrices at singular points of planar vector fields. 2006.
7
Stephen Schecter · Michael F Singer. Correction to Separatrices at singular points of planar vector fields. 1983.
8
Antonio Algaba · Isabel Checa · Cristobal Garcia · Manuel L Reyes. Local Phase Portraits through the Newton Diagram of a Vector Field. 2015.