E. Nursanto, A. Pratiwi, E. Winarno, B. Sugiarto, and R. Z. Mirahati, “Potency of Alluvial Mineral of Luk Ulo River with XRD and AAS in Kebakalan Village Kebumen”, Eksergi, vol. 19, no. 3, pp. 134–139, Nov. 2022.