UV-Vis Spectroscopy: A New Approach for Assessing the Color Index of Transformer Insulating Oil. - Yang Sing Leong; Pin Jern Ker; Md Zaini Jamaludin; Saifuddin M. Nomanbhay; Aiman bin Ismail; Fairuz Abdullah; Looe Hui Mun; Chin Kim Lo (Sensors, 2018)