@prefix skos: <http://www.w3.org/2004/02/skos/core#> .

<http://www.irandoc.acir/onto/irandoc/CHEM000537>
  skos:broader <http://www.irandoc.acir/onto/irandoc/CHEM000539> ;
  skos:prefLabel "first order perturbation theory"@en, "نظریه اختلال مرتبه اول"@fa ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept .

<http://www.irandoc.acir/onto/irandoc/CHEM000539>
  skos:prefLabel "نظریه اختلال"@fa, "perturbation theory"@en ;
  a <http://www.irandoc.ac.ir/onto/irandoc-meta/Concept>, skos:Concept ;
  skos:narrower <http://www.irandoc.acir/onto/irandoc/CHEM000537> .