About DISORT#
The official distribution of DISORT can be found here.
You may find some of the following links useful as well:
The Discrete Ordinate Algorithm, DISORT for Radiative Transfer: a chapter on the theory and implementation (2016).
Improved discrete ordinate solutions in the presence of an anisotropically reflecting lower boundary: Upgrades of the DISORT computational tool: a journal article on version 3 upgrades
DISORT report v1.1: a comprehensive report on the workings of DISORTv2.0 (2000).