Doerr, S., Ferreira, A., Coelho, C., Walsh, R., Shakesby, R., Ceballos, A., & Doerr, S. (2003). Soil Water Repellency. The impact of water-repellency on overland flow and runoff in Portugal, pp. 167-178. doi:10.1016/B978-0-444-51269-7.50018-7

Doerr, Stefan, A.J.D Ferreira, C.O.A Coelho, R.P.D Walsh, R.A Shakesby, A. Ceballos, and S.H Doerr. "Soil Water Repellency." The Impact of Water-repellency On Overland Flow and Runoff in Portugal 2003: 167-178.

Doerr, Stefan, et al. "Soil Water Repellency." The Impact of Water-repellency On Overland Flow and Runoff in Portugal 2003: 167-178.