Amara Nugrahini, Vijaya Isnaniawardhani, Adjat Sudradjat, and Nana Sulaksana. “CHARACTERISTICS OF SEMILIR FORMATION IN RELATIONSHIP WITH THE PERIOD OF VOLCANIC ACTIVITY”. GEOMATE Journal, vol. 16, no. 53, Jan. 2019, pp. 154-62, https://geomatejournal.com/geomate/article/view/2824.