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Hitoshi TAJIMA, Takahiro ISHIDA, Masayuki SAITOH, Yasunori KOBAYASHI, Yasuhiro NAKANISHI, Akio ICHIKAWA, Kazuo NISHIMURA. "THE LOOSING PHENOMENON IN THE SAND GROUND BY EXCAVATION OF CLOSE PARALLEL SHIELD TUNNELS." Doboku Gakkai Ronbunshuu C 62.2 (2006) 529-545