Ika Wilujeng, E. D., R. Widyastuti, B. Tjahjono, and Y. R. Suhardjono. “Soil Collembola on Land Affected by Pyroclastic Material of Kelud Volcano, Ngantang Malang”. Journal of Degraded and Mining Lands Management, vol. 7, no. 3, Apr. 2020, pp. 2105-10, doi:10.15243/jdmlm.2020.073.2105.