Chyła, P., S. Bednarek, A. Łukaszek-Sołek, and J. Sińczak. “STRAIN DISTRIBUTION IN ECAP PROCESS WITH VARIOUS FRICTION CONDITIONS - NUMERICAL MODELLING”. Metallurgy and Foundry Engineering, vol. 36, no. 1, June 2010, p. 13, doi:10.7494/mafe.2010.36.1.13.