Pueschel, R.,
J. M. Livingston,
P. B. Russell, D. Allen, G. Ferry, K. Snetsinger,
J. M. Livingston, and S. Verma (1994), Physical and Optical Properties of the Pinatubo Volcanic Aerosol: Aircrafts with Impactors and a Suntracking Photometer,
J. Geophys. Res., D99, 12,915-12.