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4. Bicheno J, Holweg M. The Lean Toolbox: The Essential Guide to Lean Transformation. Buckingham: PICSIE Books; 2009.
5. Sassanellia C, Pezzotta G, Rossi M, Terzia S, Cavalieri S. Towards a Lean Product Service Systems (PSS) Design: State of the Art, Opportunities and Challenges. Procedia CIRP 30. 2015; pp. 191-196.