Shieh, W.; Yi, X.; Tang, Y.: 'Transmission experiment of multi-gigabit coherent optical OFDM systems over 1000 km SSMF fibre', Electronics Letters, 2007, 43, (3), p. 183-185, DOI: 10.1049/el:20073496
IET Digital Library, https://digital-library.theiet.org/;jsessionid=9be4i9orch8fo.x-iet-live-01content/journals/10.1049/el_20073496