Simulation of the 1980 eruption of Mount St. Helens using the ash-tracking model PUFF,
Fero, J., S. N. Carey, J. T. Merrill (2008),
J. Volcan. Geotherm. Res., 175, 3 p. 355–366,
10.1016/j.jvolgeores.2008.03.029.