1. A semi-automatic level-accurate groundwater sampler;Andersen;Geological Survey of Denmark, Yearbook 1978,1979
2. Techniques for groundwater sampling;Andersen,1982
3. BOTESAM, separation pumping and capillary barrier: a remedial-action concept applicable to point pollution;Andersen,1990
4. Water withdrawal from underground lenses of fresh waters by paired boreholes;Babuschkin,1960
5. Multilevel gas-drive sampling of deep fractured rock aquifers in Virginia;Barvenik;Ground Water Monit. Rev.,1983