A. Amanov, I. Cho, Y. Pyoun, C. Lee, I. Park, Micro-dimpled surface by ultrasonic nanocrystal surface modification and its tribological effects, Wear, 286 (2012) 136-144.
 E. Hall, The deformation and ageing of mild steel: III discussion of results, Proceedings of the Physical Society. Section B, 64 (1951) 747.
 S. Bagherzadeh, K. Abrinia, Q. Han, Ultrasonic assisted equal channel angular extrusion (UAE) as a novel hybrid method for continuous production of ultra-fine grained metals, Materials Letters, 169 (2016) 90-94.
 F. Blaha, B. Langenecker, Dehnung von zink-kristallen unter ultraschalleinwirkung, Naturwissenschaften, 42 (1955) 556-556.
 H. Storck, W. Littmann, J. Wallaschek, M. Mracek, The effect of friction reduction in presence of ultrasonic vibrations and its relevance to travelling wave ultrasonic motors, Ultrasonics, 40 (2002) 379-383.
 A. Pak, A. Abdullah, An Approach to Designing a Dual Frequency Piezoelectric Ultrasonic Transducer, Journal of Stress Analysis, 1 (2017) 43-53.
 A. Siddiq, T. El Sayed, Ultrasonic-assisted manufacturing processes: variational model and numerical simulations, Ultrasonics, 52 (2012) 521-529.
 A. Eaves, A. Smith, W. Waterhouse, D. Sansome, Review of the application of ultrasonic vibrations to deforming metals, Ultrasonics, 13 (1975) 162-170.
 Y. Long, Y.N. Li, J. Sun, I. Ille, J. Li, J. Twiefel, Effects of process parameters on force reduction and temperature variation during ultrasonic assisted incremental sheet forming process, Int J Adv Manuf Technol, 97 (2018) 13-24.
 A. Karimi, S. Amini, Steel 7225 surface ultrafine structure and improvement of its mechanical properties using surface nanocrystallization technology by ultrasonic impact, Int J Adv Manuf Technol, 83 (2016) 1127-1134.
 S. Bagherzadeh, K. Abrinia, Y. Liu, Q. Han, The effect of combining high-intensity ultrasonic vibration with ECAE process on the process parameters and mechanical properties and microstructure of aluminum 1050, Int J Adv Manuf Technol, 88 (2017) 229-240.
 M. Vahdati, R. Mahdavinejad, S. Amini, Investigation of the ultrasonic vibration effect in incremental sheet metal forming process, Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture, 231 (2017) 971-982.
 F. Djavanroodi, H. Ahmadian, K. Koohkan, R. Naseri, Ultrasonic assisted-ECAP, Ultrasonics, 53 (2013) 1089-1096.
 Y. Liu, Q. Han, L. Hua, C. Xu, Numerical and experimental investigation of upsetting with ultrasonic vibration of pure copper cone tip, Ultrasonics, 53 (2013) 803-807.
 Y. Ashida, H. Aoyama, Press forming using ultrasonic vibration, Journal of Materials Processing Technology, 187 (2007) 118-122.
 J.-C. Hung, C.-C. Lin, Investigations on the material property changes of ultrasonic-vibration assisted aluminum alloy upsetting, Materials & Design, 45 (2013) 412-420.
 X. Liu, Y. Osawa, S. Takamori, T. Mukai, Microstructure and mechanical properties of AZ91 alloy produced with ultrasonic vibration, Materials Science and Engineering: A, 487 (2008) 120-123.
 L. Qingmei, Z. Yong, S. Yaoling, Q. Feipeng, Z. Qijie, Influence of ultrasonic vibration on mechanical properties and microstructure of 1Cr18Ni9Ti stainless steel, Materials & design, 28 (2007) 1949-1952.
 Z. Shao, Q. Le, Z. Zhang, J. Cui, A new method of semi-continuous casting of AZ80 Mg alloy billets by a combination of electromagnetic and ultrasonic fields, Materials & Design, 32 (2011) 4216-4224.
 E. Bitzek, P. Gumbsch, Dynamic aspects of dislocation motion: atomistic simulations, Materials Science and Engineering: A, 400 (2005) 40-44.