@article{Pfeffer:6858,
      author        = "Pfeffer, J. and Cazenave, A. and Rosat, S. and Moreira, L.
                       and Mandea, M. and Dehant, V. and Coupry, B.",
      title         = "{A 6-year cycle in the Earth system.}",
      year          = "2023",
}