Sudradjat, A., Syafri, I. and Paripurno, E. T. (2011) “The Characteristics of Lahar in Merapi Volcano, Central Java as the Indicator of the Explosivity during Holocene”, Indonesian Journal on Geoscience, 6(2), pp. 69–74. doi: 10.17014/ijog.6.2.69-74.