Immerzeel, W.W., Quiroz, R.A., De Jong, S.M. 2005. Understanding precipitation patterns and land use interaction in Tibet using harmonic analysis of SPOT VGT-S10 NDVI time series. International Journal of Remote Sensing Volume 26, issue 11 p. 2281-2296

Posadas, A.N.D., R. Quiroz, P. Zorogastúa, and C. León-Velarde. 2005. Multifractal Characterization of the Spatial Distribution of Ulexite in a Bolivian Salt Flat. International Journal of Remote Sensing Volume 26, issue 3 p. 615-627.

Reyes, Teija, Roberto Quiroz, and Shija Msikula. 2006. Socio-economic Comparison Between Traditional and Improved Cultivation Methods in Agroforestry Systems, East Usambara Mountains, Tanzania. Environmental Management Vol. 36 No. 5 p. 682-690