Petri nets for robot lattices. - Z. Ning Cai; A. Farnham; A. Ghalwash; Pedro Gómez 001; Victoria Rodellar; Robert Newcomb 001 (ICRA, 1987)

Modelling the logical structure of flexible manufacturing systems with Petri-nets. - P. David Stotts; Robert W. Newcomb; Z. Ning Cai (Comput. Commun., 1989)