Mingareev, Ilya; Weirauch, Fabian; Bonhoff, Tobias; Gehlich, Nils; Myungkoo Kang, ; Richardson, Kathleen; Richardson, Martin: 'Applications of high-power 2 m thulium fiber lasers in materials processing' (Materials, Circuits and Devices, 2019), 'Advances in High-Power Fiber and Diode Laser Engineering', Chap. 10, pp. 329-358, DOI: 10.1049/PBCS054E_ch10
IET Digital Library, https://digital-library.theiet.org/;jsessionid=1uumv7jemmq2e.x-iet-live-01content/books/10.1049/pbcs054e_ch10