Liu, K.; Digonnet, M.; Fesler, K.; Kim, B.Y.; Shaw, H.J.: 'Broadband diode-pumped fibre laser', Electronics Letters, 1988, 24, (14), p. 838-840, DOI: 10.1049/el:19880570
IET Digital Library, https://digital-library.theiet.org/;jsessionid=f01qipjdh5bqj.x-iet-live-01content/journals/10.1049/el_19880570