1. Exploration, sampling and in-situ testing of soft clay. Soft clay engineering;Andresen,1981
2. The NGI 54 mm samplers for undisturbed sampling of clays and representative sampling of coarser materials;Andresen,1979
3. NGI gas-operated, seafloor sampler;Andresen,1965
4. Strain path method;Baligh;ASCE J. Geo. Eng. Div,1985
5. Disturbance due to ideal tube sampling;Baligh;ASCE J. Geo. Eng. Div.,1987