TY - CONF AU - Mike Pratt C2 - Proceedings of the 10th IFIP WG5.2/5.3 PROLAMAT Conference [Kluwer Academic Publishers], Trento, IT DA - 1998-09-01 LA - en PB - Proceedings of the 10th IFIP WG5.2/5.3 PROLAMAT Conference [Kluwer Academic Publishers], Trento, IT PY - 1998 TI - Extension of the Standards ISO 10303 (STEP) for the Exchange of Parametric and Variational CAD Models UR - https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=821427 ER -