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1951 뱸 ¾ ȭ ̼ Ұ ߴ. 1974 [()], [ ] <л> 1ȸ λ ǰȰ ߴ. ϴ λ ǵκ ϸ ϴ ι ְ ׸ ǰ ǥؿԴ. 1986 [ ] 6ȸ л 10ȸ ۰ ޾Ҵ.
Ҽ < >(1983), < >(1985), Ҽ <ûô>(1981), < ¥>(1989), ȭ <ε Ƕ>(1994), 깮 <ϴ >(1986), <ε>(1990) ִ