1. B. A. Romantsev, I. N. Potapov, A. V. Goncharuk, and V. A. Popov, Manufacturing of Hollow Profiled Billets [in Russian], NPO “Inform TEI,” Moscow (1992).
2. I. N. Potapov and P. I. Polukhin, The Technology of Helical Rolling [in Russian], 2nd ed., Metallurgiya, Moscow (1990).
3. B. A. Romantsev, A. B. Goncharuk, Yu. V. Gamin, and A. N. Svobodov, “A study of the technology of helical rolling of small-diameter hollow billets,” in: Reports of the Int. Sci. Tech. Congress “OMD 2014. Fundamental Problems. Innovative Materials and Technologies,” Part 2, OOO “Belyi Veter,” Moscow (2014), pp. 27-32.
4. A. N. Svobodov, B. A. Romantsev, A. V. Goncharuk, Yu. V. Gamin, et al., A Device for Production of Cylindrical Blanks in the Form of a Glass, RF Patent No. 2595182, Int. Cl. В 21 B 19/04, Filing Date: Feb. 03, 2015; Publ. Date: Aug. 20, 2016; Bul. No. 23.
5. A. N. Svobodov, B. A. Romantsev, A. V. Goncharuk, Yu. V. Gamin, et al., A Method for Making Sleeve-Shaped Workpieces from a Bar, RF Patent No. 2600594, Int. Cl. В 21 K 21/06, Filing Date: Feb. 03, 2015; Publ. Date: Oct. 27, 2016; Bul. No. 23.