Lehnert, L. W., H. Meyer, W. A. Obermeier, B. Silva, B. Regeling, and J. Bendix. “Hyperspectral Data Analysis in R: The Hsdar Package”. Journal of Statistical Software, vol. 89, no. 12, May 2019, pp. 1-23, doi:10.18637/jss.v089.i12.