J. Tanjung, R. Ferial, H. G. Putra, and I. Indra, “The Aesthetic Man-made Hill: An Alternative Tsunami Vertical Evacuation for Padang City, West Sumatera, Indonesia”, Int. J. Adv. Sci. Eng. Inf. Technol., vol. 8, no. 5, pp. 2149–2154, Oct. 2018.