Szpunar, M., and T. Trzepieciński. “Prediction Of The Coefficient Of Friction In The Single Point Incremental Forming Of Truncated Cones From A Grade 2 Titanium Sheet”. Tribologia - Finnish Journal of Tribology, vol. 40, no. 1–2, July 2023, p. 4−17, doi:10.30678/fjt.127844.