• If you want the reference of papers on disability-free life expectancy in France authored by Robine, the search is:
    France AND Disability-free life expectancy AND Robine


  • If you want the reference of papers on disability-free life expectancy in France or in Belgium, the search is:
    France OR Belgium AND Disability-free life expectancy
    Note the second operator used, AND, acts on all of the first expression, France OR Belgium.


  • If you want the references of papers on disability-free life expectancy and active life expectancy but not using the Sullivan method,
    the search is:
    Disability-free life expectancy AND Active life expectancy NOT Sullivan method