Specification and qualification of welding procedures for metallic materials - Qualification based on tested welding consumables (ISO/DIS 15610:2021); German and English version prEN ISO 15610:2021
District heating pipes - Design and installation of thermal insulated bonded single and twin pipe systems for directly buried hot water networks - Part 2: Installation; German and English version EN 13941-2:2019— 195 стр.