Hofi, Laily Nur, et al. “Structural Framework of the Nyi Sindurejo Geothermal System Revealed by Gravity Data Analysis, East Java, Indonesia”. Journal of Science and Mathematics Letters, vol. 14, no. 1, Jan. 2026, pp. 69-78, https://doi.org/10.37134/jsml.vol14.1.7.2026.