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Venkiteshwaran, S.P., Gupta, B.K. & Huddar, B.B. Measurement of the electrical conductivity in the upper air by radiosonde. Proc. Indian Acad. Sci. (Math. Sci.) 38, 109–115 (1953). https://doi.org/10.1007/BF03045208
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DOI: https://doi.org/10.1007/BF03045208