61
Published: [1992]
Superior document: Contemporary mathematics, 125
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62
Published: [1990]
Superior document: Contemporary mathematics, 112
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63
Published: [1989]
Superior document: Contemporary mathematics, volume 99
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64
Published: [2002]
Superior document: Contemporary mathematics, 295
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65
Published: [1989]
Superior document: Contemporary mathematics, 100
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66
Published: [2006]
Superior document: Contemporary mathematics, 396
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67
Published: [1986]
Superior document: Contemporary mathematics, volume 55
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68
Published: [1986]
Superior document: Contemporary mathematics, volume 55
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69
Published: [2008]
Superior document: Contemporary mathematics, 452
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70
Published: [1984]
Superior document: Contemporary mathematics, volume 28
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