1. . 1999. Change of hydraulic properties and solute transport parameters in volcanic ash soils after drying. In Modelling of Transport Processes in Soils at Various Scales in Time and Space, (eds). Wageningen Academic Press, Wageningen: 267–275.
2. 1975. Dynamics of Fluids in Porous Media. Elsevier: New York; 764.
3. Use of soil survey data to select measurement techniques for hydraulic conductivity
4. . 1999. The Nature and Properties of Soils, 12th edition. Prentice-Hall: New Jersey; 879.
5. 2004. The properties of the soils of the south Ecuadorian páramo and the impact of land use changes on their hydrology. Unpublished PhD thesis, Katholieke Universiteit Leuven.