Introduction. 2017. Hall, R.J.; Fournier, R.A.; Rich, P. Pages 1-13 (Chapter 1) in R.A. Fournier and R.J. Hall, editors. Hemispherical photography for forestry: theory, methods, applications. Springer International Publishing, Switzerland.
Hierarchical characterization of canopy architecture for boreal forest. 1997. Fournier, R.A.; Rich, P.M.; Landry, R. Journal of Geophysical Research 102: 29,445-29,454.