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11
Myungsik Do,Kiyoshi Kobayashi, | 대한토목학회 | 2000 ,
12
Dinar., Ariel, 321.32-D583p | World Bank | 2000 321.32-D583p,
13
Miller, Jack E, 594.1-M647m | Van Nostrand Reinho | 1992 594.1-M647m,