Chen, Xuexia, Lee Vierling, and Don Deering. "A Simple and Effective Radiometric Correction Method to Improve Landscape Change Detection across Sensors and across Time." Remote Sensing of Environment 98.1 (2005): 63-79. ScienceDirect. Web.
Ju, Junchang, and Jeffrey G. Masek. "The Vegetation Greenness Trend in Canada and US Alaska from 1984–2012 Landsat Data." Remote Sensing of Environment 176 (2016): 1-16. ScienceDirect. Web.
Ramsayer, Kate. "NASA Studies Details of a Greening Arctic." Global Climate Change: Vital Signs of the Planet. NASA, 2 June 2016. Web. 18 Nov. 2016.
Hanqui, Xu. "Modification of Normalized Difference Water Index (NDWI) to Enhance Open Water Features in Remotely Sensed Imagery." Research Gate. International Journal of Remote Sensing, 20 July 2006. Web.