1. A. Ono, “The shape and riming properties of ice crystals in natural clouds,” J. Atmos. Sci. 26 (1), 138–147 (1969).
2. R. G. Greenler, A. J. Mallmann, M. Drinkwine, and G. Blumenthal, “The origin of sunpillars,” Am. Sci. 60, 292–302 (1972).
3. K. Sassen, “Remote sensing of planar ice crystals fall attitude,” J. Meteorol. Soc. Jpn. 58 (5), 422–429 (1980).
4. B. V. Kaul’ and I. V. Samokhvalov, “Orientation of particles in Ci crystal clouds. Part 1. Orientation at gravitational sedimentation,” Atmos. Ocean. Opt. 18 (11), 866–870 (2005).
5. V. P. Galileiskii, A. G. Borovoi, G. G. Matvienko, and A. M. Morozov, “Specularly reflected component at light scattering by ice crystals with predominant orientation, ” Atmos. Ocean. Opt. 21 (9), 668–673 (2008).