1. Report on the activity of Aso volcano, February, 1933;Aoki;Kenshinjihou,1940
2. Pyroclastic Rocks;Fisher,1978
3. Eruptive history of the past 80,000 years of Aso volcano and the 1989 eruption;Hayakawa;Bull. Volcanol. Soc. Jpn.,1991
4. The phreatomagmatic and strombolian eruption events at White Island volcano 1976–1982: Eruption narrative;Houghton,1989
5. The 1989 eruption of Naka-dake, Aso volcano;Ikebe;Bull. Volcanol. Soc. Jpn.,1989