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1Published 1990“...HE 8689.2 .P117...”
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2Published 1999“...HE 8689.9 .N5 .C855 1999...”
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3Published 1998“...HE 8689.9 .N5 .N53205 1998...”
Conference Proceeding Book -
4Published 1999“...HE 8689.9 .N5 .N53205 1999...”
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5Published 1997“...HE 8700.9 .N5 .N5323...”
Conference Proceeding Book