Christo Zietsman <13422863@sun.ac.za>
http://www.cs.sun.ac.za/~caz/index.html

Mauro A. Homem Antunes
http://www.ltid.inpe.br/dsr/mauro/6s/index.html

Vermote, E.F., Tanre, D., Deuze, J.L., Herman, M., and Morcrette,
    J.J., (1997), Second simulation of the satellite signal in
    the solar spectrum, 6S: An overview., IEEE Trans. Geosc.
    and Remote Sens. 35(3):675-686.
http://loasys.univ-lille1.fr/informatique/sixs_gb.html