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1992 Jun 26: ±èÇü¼ø(Purdue Univ.);  Semi-Continuous Elements in C*-algebras

1994 Apr 15: ±èÇü¼ø(¿¬¼¼´ë);  An Interpolation Theorem for Unbounded Operators

1994 Nov 18: ±èÇü¼ø(¿¬¼¼´ë);  Multipliers of C*-algebras