1
Published: [1985]
Superior document: Contemporary mathematics, volume 42
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2
Published: [1990]
Superior document: Contemporary mathematics, volume 108
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3
Published: [1982]
Superior document: Contemporary mathematics, volume 11
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4
Published: [1983]
Superior document: Contemporary mathematics, volume 25
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5
Published: [1992]
Superior document: Contemporary mathematics, 129
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6
Published: 2012.
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7
Published: [1992]
Superior document: Contemporary mathematics, 127
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