Extending a turbid medium BRDF model to allow sloping terrain with a vertical plant stand. - Bruno Combal; Harumi Isaka; Craig Trotter (IEEE Trans. Geosci. Remote. Sens., 2000)

The effect of small topographic variations on reflectance. - Bruno Combal; Harumi Isaka (IEEE Trans. Geosci. Remote. Sens., 2002)