J.O, G., M. O.M, and K. M.S.K. “Attenuation Losses Due to Changes in Curvature, Temperature, and Pressure in Optical Fiber Cables”. Indonesian Journal of Physics, Vol. 21, no. 4, Nov. 2016, pp. 93-99, doi:10.5614/itb.ijp.2010.21.4.1.