lee et al. 1998

lee et al. 1998

lee et al. 1998, lee et al. 1997, lee et al. 1988, lee et al. 1999, lee et al. 1994, lee et al. 1991, lee et al. 1993, lee et al. 1996

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lee et al. 1998
lee et al. 1998

lee et al. 1998


lee et al. 1997
lee et al. 1997

lee et al. 1997


lee et al. 1988
lee et al. 1988

lee et al. 1988


lee et al. 1999
lee et al. 1999

lee et al. 1999


lee et al. 1994
lee et al. 1994

lee et al. 1994


lee et al. 1991
lee et al. 1991

lee et al. 1991


lee et al. 1993
lee et al. 1993

lee et al. 1993


lee et al. 1996
lee et al. 1996

lee et al. 1996


lee et al. 1998, lee et al. 1997, lee et al. 1988, lee et al. 1999, lee et al. 1994, lee et al. 1991, lee et al. 1993, lee et al. 1996

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