J. Hastings, W. Ceusters, B. Smith, and K. Mulligan. Proceedings of the 2nd International Conference on Biomedical Ontology, volume 833 of CEUR Workshop Proceedings, (Jul 30, 2011)
K. Henderson. U.S. Department of Education, Office of Special Education and Rehabilitative Services; U.S. Department of Education, Office of Special Education Programs, Washington, DC, (August 2008)