5.
Liu F. C., Hovanski Y., Miles M. P., Sorensen C. D. and Nelson T. W. (2018): A review of friction stir welding of steels: Tool, material flow, microstructure, and properties.– Journal of Materials Science & Technology, vol.34, No.1, pp.39-57, doi.org/10.1016/j.jmst.2017.10.024.