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Biagi, P. F. and Bella, F. and Cozzi, E. and Ermini, A. and Martinelli, G. and Khatkevich, Y.M. and Gordeev, E.I. and Zilpimiani, D. (1999) Groundwater helium content related to the Spitak (Armenia) and Karymsky (Russia) earthquakes. Il nuovo cimento C, 22 C (3-4). pp. 399-406. ISSN 1826-9885