@article{Duval:2015,
  author  = "G. Duval and A. Maciejewski",
  title   = "Integrability of potentials of degree [...]. Second order variational equations between Kolchin solvability and abelianity",
  journal = "Discrete and Continuous Dynamical Systems - Series A",
  volume  = "Vol. 35",
  number  = "no. 5",
  pages   = "1969--2009",
  year    = "2015",
}