1. Impulse radar sounding in permafrost
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3. Microprocessor-Based Data-Acquisition System for a Borehole Radar
4. S. Carlsten, K.A. Magnusson, and O. Olsson, 1985 . Crosshole investigations . Description of the small scale site. Stripa Project IR 85-05, SKB, Stockholm, Sweden.
5. Experimental uses of short pulse radar in coal seams