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11
Garey, Michael R, 005.4-G229c | W. H. Freeman and Company | 1979 005.4-G229c,
12
Johnson, David E., 701.5-J66a | Princeton University Press | 1980 701.5-J66a,
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Johnson, David E, 561.1-J66호 | 아진 | 1999 561.1-J66호,