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2. Probing oil fields;Nakstad,2008
3. Industrial applications of FOG;Kugami,1999
4. The origin, history and future of fibre optic interferometric acoustic sensors for US Navy applications;Cole,2011
5. E. Udd, ‘Fiber Optic Sensors Based on the Sagnac Interferometer and Passive Ring Resonator,’ in Fiber Optic Sensors: An Introduction for Engineers and Scientists, Edited by E. Udd, Wiley, 1991.