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J. Boll, Steenhuis, T. S., and Selker, J., “Fiberglass wicks for sampling of water and solutes in the vadose zone”, Soil Science Society of America Journal, vol. 56, pp. 701–707, 1992.
J. Boll, Selker, J., Nijssen, B. M., Steenhuis, T. S., Van Winkle, J., and Jolles, E., “Water quality sampling under preferential flow conditions”, in Lysimeters for Evapotranspiration and Environmental Measurements, 1991.
J. Boll, Steenhuis, T. S., Selker, J., Nijssen, B. M., and Ochs, E. S., “Fiberglass wicks for sampling water and solutes from the unsaturated zone”, Paper-American Society of Agricultural Engineers (USA), 1990.