Beetz, Jakob, et al. “IfcOWL: A Case of Transforming EXPRESS Schemas into Ontologies”. Artificial Intelligence for Engineering Design, Analysis and Manufacturing, vol. 23, no. 1, 2008, pp. 89-101, https://doi.org/10.1017/s0890060409000122.
Beetz, J., van Leeuwen, J., & de Vries, B. (2008). IfcOWL: A case of transforming EXPRESS schemas into ontologies. Artificial Intelligence for Engineering Design, Analysis and Manufacturing, 23(1), 89-101. https://doi.org/10.1017/s0890060409000122
Beetz J, van Leeuwen J, de Vries B. IfcOWL: A case of transforming EXPRESS schemas into ontologies. Artificial Intelligence for Engineering Design, Analysis and Manufacturing. 2008;23(1):89-101.