Utami, S. R., Agustina, C., Wicaksono, K. S., Prasojo, B. D. and Hanifa, H. (2017) “Utilization of locally available organic matter to improve chemical properties of pyroclastic materials from Mt. Kelud of East Java”, Journal of Degraded and Mining Lands Management. Malang, Indonesia, 4(2), pp. 717–721. doi: 10.15243/jdmlm.2017.042.717.