J. Hastings, N. Novère, W. Ceusters, K. Mulligan, and B. Smith. Proceeedings of the Third International Conference on Biomedical Ontology, volume 897 of CEUR Workshop Proceedings, CEUR, (Jul 24, 2012)
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)