Refractive indices of aerosols in the upper troposphere and lower stratosphere
Baumgardner, D., J.E. Dye, B.W. Gandrud, K. Barr, K. Kelly, and . Chan (1996), Refractive indices of aerosols in the upper troposphere and lower stratosphere, Geophys. Res. Lett., 23, 749-752.