References

1. Institut Bauen und Umwelt e.V. "Product Category Rules for Construction Products from the range of Environmental Product Declarations of IBU, Part A: Calculation Rules for the Life Cycle Assessment and Requirements on the Background Report", 2013.
2. Institut Bauen und Umwelt e.V. "Product Category Rules for Construction Products from the range of Environmental Product Declarations of IBU, Part B: Requirements on the EPD for Pre-cast concrete components, Version 1.6", 2014.
3. The Norweigan EPD Foundation. "Product-Category Rules For preparing an environmental declaration (EPD) for Product Group-Precast Concrete Products, NPCR20", 2012.
4. Danish Technological Institute. "Guidelines-Uptake of carbon dioxide in the life cycle inventory of concrete", 2005.
5. EN 16757 Sustainability of construction works - Environmental product declarations - Product Category Rules for concrete and concrete elements, 2017.