Close Monitoring and forecasting Etna volcanic plumes,
Scollo, S., M. Prestifilippo, G. Spata, M. D'gostino, M. Coltelli (2009),
Nat. Hazards Earth Syst. Sci., 9, 5 p. 1573–1585,
10.5194/nhess-9-1573-2009.