Takayuki Shiraiwa, Yaroslav D. Muravyev, Satoru Yamaguchi, Stratigraphic Features of Firn as Proxy Climate Signals at the Summit Ice Cap of Ushkovsky Volcano, Kamchatka, Russia, Arctic and Alpine Research, Vol. 29, No. 4 (Nov., 1997), pp. 414-421
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Shiraiwa et al. (1997) studied this question.
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