Alexei Tsygvintsev. On the existence of polynomial first integrals of quadratic homogeneous systems of ordinary differential equations.
Journal of Physics A: Mathematical and General (1975 - 2006), IOP Publishing, 2001, 34 (11), pp.2185-2193.
⟨10.1088/0305-4470/34/11/311⟩.
⟨ensl-03051425⟩