@prefix n9j: <http://data.loterre.fr/ark:/67375/N9J> .
@prefix isothes: <http://purl.org/iso25964/skos-thes#> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .

n9j:-concepts
  a isothes:ConceptGroup ;
  skos:prefLabel "concepts"@en ;
  skos:member n9j:-RFR84F1W-P .

n9j:-TQ0RTPNV-B
  skos:prefLabel "studies of aging"@en ;
  a skos:Concept ;
  skos:narrower n9j:-RFR84F1W-P .

n9j:-RFR84F1W-P
  owl:sameAs <https://concepts.sagepub.com/social-science/concept/Duke_Longitudinal_Studies> ;
  skos:definition "The Duke Longitudinal Studies of Aging, initiated in 1955, consist of two separate studies. The first longitudinal study began in 1955 with 271 persons 60 to 90 years of age. [Source: Encyclopedia of Health & Aging; Duke Longitudinal Studies]"@en ;
  a skos:Concept ;
  skos:inScheme n9j: ;
  skos:broader n9j:-TQ0RTPNV-B ;
  skos:prefLabel "Duke Longitudinal Studies"@en .

n9j: a skos:ConceptScheme .