TY - JOUR AU - Spackman, K A; Dionne, R; Mays, E; Weis, J TI - Role grouping as an extension to the description logic of Ontylog, motivated by concept modeling in SNOMED JO - Proc AMIA Symp PY - 2002 L3 - PubMed-ID: 12463917 SP - 712 EP - 6 ER -