Double vector quarkonia production in exclusive Higgs boson decays
  Partial decay widths and branching fractions are calculated for the exclusive decays of the Standard Model Higgs boson into a pair of vector quarkonium states, $ H\to J/\psi J/\psi, H\to \Upsilon \Upsilon, H\to J/\psi \phi, H\to J/\psi \Upsilon$, with relativistic corrections due to quark motion in mesons taken into account. 
V. Kartvelishvili, A. V. Luchinsky, A. A. Novoselov