R.Z. Valiev, I.P. Semenova, V.V. Latysh, H. Rack, T.C. Lowe, J. Petruzelka, L. Dluhos, D. Hrusak, J. Sochová, Nanostructured titanium for biomedical applications, Advanced engineering materials, 10(8) (2008).
 Y. Okazaki, E. Gotoh, Comparison of metal release from various metallic biomaterials in vitro, Biomaterials, 26(1) (2005) 11-21.
 Y. Li, C. Wong, J. Xiong, P. Hodgson, C. Wen, Cytotoxicity of titanium and titanium alloying elements, Journal of dental research, 89(5) (2010) 493-497.
 B. Ratna Sunil, A. Thirugnanam, U. Chakkingal, T. Sampath Kumar, Nano and ultra fine grained metallic biomaterials by severe plastic deformation techniques, Materials Technology, 31(13) (2016) 743-755.
 E. Hall, The deformation and ageing of mild steel: III discussion of results, Proceedings of the Physical Society. Section B, 64(9) (1951) 747.
 K. Edalati, Z. Horita, A review on high-pressure torsion (HPT) from 1935 to 1988, Materials Science and Engineering: A, 652 (2016) 325-352.
 P. Lejček, Grain boundaries: description, structure and thermodynamics, in: Grain Boundary Segregation in Metals, Springer, 2010, pp. 5-24.
 J. Li, J. Zhao, S. Liu, M. Han, Effects of low angle boundaries on the mechanical properties of single crystal superalloy DD6, Superalloys, (2008) 443-451.
 A. Podolskiy, H. Ng, I. Psaruk, E. Tabachnikova, R. Lapovok, Cryogenic equal channel angular pressing of commercially pure titanium: microstructure and properties, Journal of Materials Science, 49(19) (2014) 6803-6812.
 R. Valiev, Nanostructuring of metals by severe plastic deformation for advanced properties, Nature materials, 3(8) (2004) 511-516.
 V. Segal, V. Reznikov, A. Drobyshevskii, V. Kopylov, Plastic working of metals by simple shear, Russ. Met., (1) (1981) 99-105.
 P.S. Roodposhti, N. Farahbakhsh, A. Sarkar, K.L. MURTY, Microstructural approach to equal channel angular processing of commercially pure titanium—A review, Transactions of Nonferrous Metals Society of China, 25(5) (2015) 1353-1366.
 V.V. Stolyarov, Y.T. Zhu, I.V. Alexandrov, T.C. Lowe, R.Z. Valiev, Influence of ECAP routes on the microstructure and properties of pure Ti, Materials Science and Engineering: A, 299(1-2) (2001) 59-67.
 G. Purcek, O. Saray, O. Kul, I. Karaman, G. Yapici, M. Haouaoui, H. Maier, Mechanical and wear properties of ultrafine-grained pure Ti produced by multi-pass equal-channel angular extrusion, Materials Science and Engineering: A, 517(1) (2009) 97-104.
 D.-H. Kang, T.-W. Kim, Mechanical behavior and microstructural evolution of commercially pure titanium in enhanced multi-pass equal channel angular pressing and cold extrusion, Materials & Design, 31 (2010) S54-S60.
 V.L. Sordi, M. Ferrante, M. Kawasaki, T.G. Langdon, Microstructure and tensile strength of grade 2 titanium processed by equal-channel angular pressing and by rolling, Journal of Materials Science, 47(22) (2012) 7870-7876.
 V. Stolyarov, L. Zeipper, B. Mingler, M. Zehetbauer, Influence of post-deformation on CP-Ti processed by equal channel angular pressing, Materials Science and Engineering: A, 476(1) (2008) 98-105.
 V. Stolyarov, V. Latysh, R. Valiev, Y. Zhu, T. Lowe, The development of ultrafine-grained Ti for medical applications, in: Investigations and Applications of Severe Plastic Deformation, Springer, 2000, pp. 367-372.
 S. Semiatin, D. DeLo, V. Segal, R. Goforth, N. Frey, Workability of commercial-purity titanium and 4340 steel during equal channel angular extrusion at cold-working temperatures, Metallurgical and Materials Transactions A, 30(5) (1999) 1425-1435.
 I. Kim, J. Kim, D.H. Shin, K.-T. Park, Effects of grain size and pressing speed on the deformation mode of commercially pure Ti during equal channel angular pressing, Metallurgical and Materials Transactions A, 34(7) (2003) 1555-1558.
 C. Wegst, Key to steel, Verlag Stahlschlüssel Wegst GMBH, (0.050) (1998) 0.004.
 T. Kon’Kova, S.Y. Mironov, A. Korznikov, Severe cryogenic deformation of copper, The Physics of Metals and Metallography, 109(2) (2010) 171-176.
 D. Gunderov, A. Polyakov, I. Semenova, G. Raab, A. Churakova, E. Gimaltdinova, I. Sabirov, J. Segurado, V. Sitdikov, I. Alexandrov, Evolution of microstructure, macrotexture and mechanical properties of commercially pure Ti during ECAP-conform processing and drawing, Materials Science and Engineering: A, 562 (2013) 128-136.