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Umezawa, Hirokazu
Nihon Genshiryoku Gakkai-Shi, 32(7), p.658 - 660, 1990/07
no abstracts in English
; Hashimoto, Kazuyuki
Nihon Genshiryoku Gakkai-Shi, 32(7), p.680 - 683, 1990/07
no abstracts in English