Hybrid simulation of interacting discrete and continuous systems. - Udo Graefe; L. K. Nenonen; K. A. Strobele (WSC, 1974)

Interactive computer modelling of truck/shovel operations in an open-pit mine. - L. K. Nenonen; Udo Graefe; Albert W. Chan (WSC, 1981)

An Enterprise Model as a Design Tool for Information Infrastructure. - Udo Graefe; Albert W. Chan (DIISM, 1993)