# The number of limit cycles of a quadratic vector field with a unique singularity

Is there a uniform upper bound for the number of limit cycles of a quadratic vector field which has a unique singular point in the plane?

This survey seems to indicate that the answer is $1.$
• Thank you for this survey. What part of the survey indicate to $1$? Does the class I contains all quadratic vector field with a unique singularity? Sep 5 '17 at 4:46