Martin Ph. (2018).
   Evaluating Ontology Completeness via SPARQL and 
      Relations-between-classes based Constraints.
   Proceedings of IEEE 
      QUATIC 2018 (pp. 255–263),
      11th International Conference on the 
      Quality of Information and Communications Technology,
      Coimbra, Portugal, September 4-7, 2018. 
PDF version.       
   PDF version as published.