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Multilingual
1
Wetzel, Robert G., 454.9-W544'l | Springer verlag | 1990 454.9-W544'l,
2
Wetzel, Robert G., 454.9-W544'l-안진홍 | Saunders | 1983 454.9-W544'l-안진홍,
3
Rees, Anthony. R., 439.7-R328p | Oxford University Press | 1992 439.7-R328p,
4
Wetzels, Leo., 701-W544s | Foris Publications | 1985 701-W544s,