1. Algorithms for Minimizing without Derivatives;Brent,1973
2. Optical Properties of Inhomogeneous Materials: Applications to Geology, Astronomy, Chemistry, and Engineering;Egan,1979
3. Bidirectional reflectance spectroscopy 1. Theory;Hapke;J. Geophys. Res.,1981
4. Bidirectional reflectance spectroscopy 4: The extinction coefficient and the opposition effect;Hapke;Icarus,1986
5. Theory of Reflectance and Emittance Spectroscopy;Hapke,1993