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1
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2
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3Published 1989“...Research and Education Association,...”
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4Published 1989“...Research and Education Association,...”
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5Published 1989“...Research and Education Association,...”
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6Published 1989“...Research and Education Association,...”
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7Published 1993“...Research and Education Association,...”
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8Published 1994“...Research & Education Association,...”
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9Published 1995“...Research and Education Association,...”
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10
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11
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12
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13
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14Published 1996“...Research & Education Association,...”
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15
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16Published 1988“...Research and Education Association,...”
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17
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18
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19Published 1998“...Research and Education Association,...”
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20Published 1993“...Research & Education Association,...”
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