Hi if anyone could access the following I would be very grateful.

Radiative transfer model for heterogeneous 3-D scenes
D. S. Kimes and J. A. Kirchner
Applied Optics, Vol. 21, Issue 22, pp. 4119-4129 (1982) doi:10.1364/AO.21.004119

Hi, I can get this. PM me your email address and I'll send it to you. :)

thanks for sending that :-)