@inbook{inbook, title  = {{The smile in older age}},

 publisher = {{Routledge}},

 url = {{https://doi.org/10.4324/9781003292227-19 }},

 year = {{2025}},

 month = {{12}},

 author = {{Warren L and Kettle J and Gibson B}},

 doi = {{10.4324/9781003292227-19}},

 pages = {{153-160}},

 note = {{Accessed on 2026/03/16}}}