A. Mazlan, A. Z., M. H. A. Satar, M. H. Hamdan, M. S. Md. Isa, S. Man, M. A. R. Paiman, M. Z. Abd. Ghapar, M. S. A. Sulaiman, and T. Miyashita. “Characterisation of the Humming-Type Noise and Vibration of the Automotive HVAC System”. International Journal of Automotive and Mechanical Engineering, vol. 16, no. 2, July 2019, pp. 6634-48, doi:10.15282/ijame.16.2.2019.12.0499.