@article{PortaDiRienzoWesseletal.2009,
  author    = {Alberto Porta and Marco Di Rienzo and Niels Wessel and J{\"u}rgen Kurths},
  title     = {Addressing the complexity of cardiovascular regulation},
  doi       = {10.1098/rsta.2008.0292},
  url       = {http://rsta.royalsocietypublishing.org/},
  year      = {2009},
}