Symmetry of Quadratic Homogeneous Differential Systems
  In this paper, the symmetry group of a differential system of n quadratic homogeneous first order ODEs of n variables is studied. For this purpose, we consider the action of both point and contact transformations to signify the corresponding Lie algebras. We also find the independent differential invariants of these actions. 
Mehdi Nadjafikhah, Ali Mahdipour-Shirayeh