Agustin, Helfi, et al. “When Remaining Volcanic Eruptions Become Tourism Commodities: A Risk Analysis of Merapi Lava Tour Tourism Objects in Yogyakarta”. Jurnal Kesehatan Komunitas (Journal of Community Health), vol. 8, no. 2, July 2022, pp. 219-28, doi:10.25311/keskom.Vol8.Iss2.1077.