[1] Fruehan, R. J.: The Making, Shaping and Treating of Steel, Pittsburgh, USA, 759 p. ISBN: 0-930767-02-0.
[2] Stolte, G.: Secondary Metallurgy - Fundamentals, Processes, Aplications. Stahleisen Communications, Germany, 2002, 216 p., ISBN 978-3-514-00648-5.