Vadim Ermolayev Natalya Keberle Wolf-Ekkehard Matzke An Upper Level Ontological Model for Engineering Design Performance Domain. 98-113 2008 ER http://dx.doi.org/10.1007/978-3-540-87877-3_9 conf/er/2008 db/conf/er/er2008.html#ErmolayevKM08