1. Deep snow measurements suggested using cosmic radiation;Bissell;Water Resour. Res.,1974
2. A cosmic-ray snow gauge;Kodama;Int. J. Appl. Radiat. Isot.,1975
3. Determination of water equivalent of snow cover by the method of aerial Gamma-survey;Kogan;Sov. Hydrol. Sel. Pap.,1965
4. High pressure BF3 proportional counter;Mihara;Riken-Hokoku,1978
5. On the radioactive snow gauge with wireless telemetering system;Otsuka;Bull. Jpn. Electr. Soc.,1957