Biblio
] , “Use of ground penetrating radar to improve water quality monitoring in the vadose zone”, in Preferential Flow, Proceedings of American Society of Agricultural Engineers National Symposium on Preferential Flow. Chicago, IL, 1991.
, “Flow regimes in sandy soils with inclined layers”, Proceedings of 10th Annual AGU-Hydrology Days, Colorado State University, Fort Collins, April, pp. 10–12, 1990.