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[40]
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[31]
World news
[J].
Industry and Environment,
1997, 20 (04)
[32]
World news
[J].
Glass Industry,
2000, 81 (03)
[34]
World news
[J].
No-Dig International,
2002, 13 (05)
[36]
World news
[J].
Industry and Environment,
1990, 13 (02)
[37]
World news
[J].
Glass Industry,
1998, 79 (06)
[38]
'World news'
[J].
RARITAN-A QUARTERLY REVIEW,
2007, 26 (03)
:168-175
[40]
World news
[J].
World Tunnelling and Subsurface Excavation,
1993, 6 (06)