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1Published 1994“…Research and education association…”
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3Published 1987“…Research and Education Association…”
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5Published 1995“…Research and Education Association…”
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6Published 1986“…Research and Education Association,…”
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10Published 1998“…Research and Education Association…”
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17Published 1984“…Research and Education Association…”
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19Published 1992“…Research and Education Association,…”
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20Published 1993“…Research and Education Association,…”
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