1. ISO 14044. (2006), “Environmental Management—Life Cycle Assessment.” Geneva: International Organisation for Standardisation.
2. ISO 14067. (2018), “Greenhouse Gases—Carbon Footprint of Products—Requirements and Guidelines for Quantification.” Geneva: International Organisation for Standardisation.
3. DIN EN 16258. (2013), “Methodology for Calculation and Declaration of Energy Consumption and GHG Emissions of Transport Services (Freight and Passengers).” Deutsches Institut für Normung e.V.
4. Influence of tribology on global energy consumption, costs and emissions