TY  JOUR
TI  On the number invariant line of planar polynomial differential systems from above estimate
KW  polynomial differential systems
KW  invariant straight line
KW  singular point
KW  isoclines
KW  incident
JO  Actual directions of scientific researches of the XXI century: theory and practice
AU  Ushkho, A..
AU  Tlyachev, V..
AU  Ushkho, D..
PY  2014
IS  2
PB  FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov