TY - RPRT TI - OntoSTEP : OWL-DL ontology for STEP AU - Krima, Sylvere AU - Barbau, Raphael AU - Fiorentini, Xenia AU - Sudarsan, Rachuri AU - Sriram, Ram D PY - 2009 PB - National Institute of Standards and Technology CY - Gaithersburg, MD SN - NIST IR 7561 DO - 10.6028/NIST.IR.7561 ER -