@inproceedings{RisserBell,
  author    = {Risser, Ralf and Bell, Daniel},
  title     = {Mobility Behaviour and Mobility Needs of older People. Ageing Clinical and Experimental Reserach, Official Journal of the Italian Society of Gerontology and Geriatrics},
  series = {VII European Congress - Healthy and Active Ageing for all Europeans - II},
  booktitle = {VII European Congress - Healthy and Active Ageing for all Europeans - II},
  pages     = {147},
  subject      = {Mobility},
  language  = {en}
}
@inproceedings{RisserBell,
  author    = {Risser, Ralf and Bell, Daniel},
  title     = {Fitness to drive and mobility behaviour among senior road users. Fit to Drive},
  series = {5th International Traffic Expert Congress, Proceedings. Schriftenreihe Fahreignung},
  booktitle = {5th International Traffic Expert Congress, Proceedings. Schriftenreihe Fahreignung},
  editor    = {Divera, Twisk and Nickel, Wolf-R{\"u}diger},
  publisher = {Kirschbaum Verlag},
  address   = {Bonn},
  subject      = {Mobility},
  language  = {en}
}