1. DIN EN 1090‐2(2018)Execution of steel structures and aluminium structures ‐ Part 2: Technical requirements for steel structures.
2. DIN EN ISO 5817(2014)Welding ‐ Fusion‐welded joints in steel nickel titanium and their alloys (beam welding excluded) ‐ Quality levels for imperfections.
3. DIN EN ISO 15614‐1(2020)Specification and qualification of welding procedures for metallic materials ‐ Welding procedure test ‐ Part 1: Arc and gas welding of steels and arc welding of nickel and nickel alloys.
4. Volz M. Spannaus M. Holzer S.(2021)Eine Pore in der Schweißnaht ‐ was nun? Ein Beitrag zum Stahlbau zwischen Planung und Ausführung.Manuskript zur Großen Schweißtechnischen Tagung beim DVS‐Kongress 2021.
5. DIN EN ISO 9000(2015)Quality management systems ‐ Fundamentals and vocabulary.