Whitebox Geospatial Analysis Tools can be referenced with the following presentation:
Lindsay, J.B. (2014) The Whitebox Geospatial Analysis Tools project and open-access GIS, Proceedings of the GIS Research UK 22nd Annual Conference, The University of Glasgow, 16-18 April, DOI: 10.13140/RG.2.1.1010.8962.
Other research papers by members of the Whitebox GAT development team that use Whitebox for spatial analysis in various applications include the following:
Lindsay JB. In Press. Efficient hybrid breaching-filling sink removal methods for flow path enforcement in digital elevation models. Hydrological Processes. DOI: 10.1002/hyp.10648
Lindsay JB, Cockburn J, Russell H. 2015. An integral image approach to performing multi-scale topographic position analysis. Geomorphology 245: 51-61. DOI: http://dx.doi.org/10.1016/j.geomorph.2015.05.025
Lindsay J, Dhun K. 2015. Modelling surface drainage patterns in altered landscapes using LiDAR. International Journal of Geographical Information Science 29: 1-15. DOI: 10.1080/13658816.2014.975715
Lindsay JB, Seibert J. 2013. Measuring the significance of a divide to local drainage patterns. International Journal of Geographical Information Science 27: 1453-1468.