Modelling the World in States
                        Year: 2007
                        Author: Korpela, Tapio; Karjalainen, Jussi A.
                        Series: ICED
                        Section: User
                        Page(s): 847-848 (exec. Summ.), full paper no. DS42_P_50
                        
Keywords: Process modelling, requirements modelling, theory of technical systems