Abd Alkareem, Mariam Jamal, and Soudad S. Ahmed. “Surface Plasmon Resonance (SPR)-Based Multimode Optical Fiber Sensors for Electrical Transformer Oil Aging Detection”. Iraqi Journal of Physics, vol. 21, no. 4, Dec. 2023, pp. 84-91, https://doi.org/10.30723/ijp.v21i4.1123.