Ciurana, J., Ferrer, I. and Gao, J. X. ORCID: 0000-0001-5625-3654 (2006) Activity model and computer aided system for defining sheet metal process planning. Journal of Materials Processing Technology, 173 (2). pp. 213-222. ISSN 0924-0136 (doi:https://doi.org/10.1016/j.jmatprotec.2005.11.031)