1. Hodgson, R., Keller, P.: QUDT - Quantities, Units, Dimensions and Data Types in OWL and XML, http://www.qudt.org/ (accessed on November 14, 2012)
2. NASA: Jet Propulsion Laboratory: Semantic Web for Earth and Environmental Terminology (SWEET), http://sweet.jpl.nasa.gov/ (accessed on November 14, 2012)
3. Rijgersberg, H., Wigham, M., Broekstra, J., van Assem, M., Top, J.: Ontology of units of Measure (OM), http://www.qudt.org/ (accessed on November 14, 2012)
4. Lecture Notes in Computer Science;C. Do,2013
5. Euzenat, J.: Semantic precision and recall for ontology alignment evaluation. In: Proc. 20th International Joint Conference on Artificial Intelligence (IJCAI), pp. 348–353 (2007)