Zimanowski, Bernd; Wohletz, Kenneth; Dellino, Pierfrancesco; Büttner, Ralf (March 2003). "The volcanic ash problem". Journal of Volcanology and Geothermal Research. 122 (1–2): 1–5. Bibcode:2003JVGR..122....1Z. doi:10.1016/S0377-0273(02)00471-7.
Dufek, J.; Manga, M. (16 September 2008). "In situ production of ash in pyroclastic flows". Journal of Geophysical Research. 113 (B9): B09207. Bibcode:2008JGRB..113.9207D. doi:10.1029/2007JB005555.
Kueppers, U.; Putz, C.; Spieler, O.; Dingwell, D.B. (2009). "Abrasion in pyroclastic density currents: insights from tumbling experiments". Physics and Chemistry of the Earth, Parts A/B/C. 45–46: 33–39. Bibcode:2012PCE....45...33K. doi:10.1016/j.pce.2011.09.002.
Zimanowski, Bernd; Wohletz, Kenneth; Dellino, Pierfrancesco; Büttner, Ralf (March 2003). "The volcanic ash problem". Journal of Volcanology and Geothermal Research. 122 (1–2): 1–5. Bibcode:2003JVGR..122....1Z. doi:10.1016/S0377-0273(02)00471-7.
Dufek, J.; Manga, M. (16 September 2008). "In situ production of ash in pyroclastic flows". Journal of Geophysical Research. 113 (B9): B09207. Bibcode:2008JGRB..113.9207D. doi:10.1029/2007JB005555.
Kueppers, U.; Putz, C.; Spieler, O.; Dingwell, D.B. (2009). "Abrasion in pyroclastic density currents: insights from tumbling experiments". Physics and Chemistry of the Earth, Parts A/B/C. 45–46: 33–39. Bibcode:2012PCE....45...33K. doi:10.1016/j.pce.2011.09.002.