Modelling and optimization of multi-level processing environment - discrete approachRiismaa, Tiit5th International Conference on Optimal Research "Simulation and Optimization in Business and Industry" : May 17-20, 2006, Tallinn, Estonia : programme and abstracts2006 / p. 10 Modelling and optimization of multi-level processing environment - discrete approachRiismaa, TiitInternational Conference on Operational Research : Simulation and Optimisation in Business and Industry : May 17-20, 2006, Tallinn, Estonia2006 / p. 124-128 : ill