1. SMS Group: Cold Pilger Technology, https://www.sms-group.com/plants/all-plants/cold-pilger-mills, acc. March 13, 2017.
2. SPECITUBES: Seamless Tubes, http://leggettaerospace.com/specitubes, acc. March 13, 2017.
3. TUBACEX Group: Seamless Stainless Steel and High Nickel Alloy Tubes and Pipes, www.tubacex.com/?seamlessstainless-steel-and-high-nickel-alloy-tubes-and-pipes&Z=e233bea4390448fc& P=4b47e84df7ldblf7, acc. March 13, 2017.
4. V. F. Frolov, V. N. Danchenko, and Ya. V. Frolov, Cold Pilger Rolling of Pipe/Tube, Porogi, Dnepropetrovsk (2005).
5. Yu. F. Shevakin, A. P. Kolikov, and Yu. N. Raikov, Pipe and Tube Production: Textbook, Intermet Engineering, Moscow (2005).