Simpson, D.A.; Baxter, G.W.; Collins, S.F.; Keith Gibbs, W.E.; Blanc, W.: 'Energy transfer processes related to the S-band transition in Tm<sup>3+</sup> doped silica fibres', IET Conference Proceedings, 2005, p. v3:759-v3:759, DOI: 10.1049/cp:20050708
IET Digital Library, https://digital-library.theiet.org/;jsessionid=rxl4eatn7k4p.x-iet-live-01content/conferences/10.1049/cp_20050708