21
Published: [1987]
Superior document: Contemporary mathematics, volume 63
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22
Published: [2001]
Superior document: Contemporary mathematics, 283
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23
Published: [2003]
Superior document: Contemporary mathematics ; 335
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24
Published: [1999]
Superior document: Contemporary mathematics, 245
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25
Published: [1988]
Superior document: Contemporary mathematics ; volume 73
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26
Published: [1988]
Superior document: Contemporary mathematics, 81
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27
Published: [1988]
Superior document: Contemporary mathematics, volume 74
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28
Published: [1985]
Superior document: Contemporary mathematics, volume 41
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29
Published: [1986]
Superior document: Contemporary mathematics, volume 50
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30
Published: [1985]
Superior document: Contemporary mathematics, volume 36
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31
Published: [2003]
Superior document: Contemporary mathematics ; 339
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32
Published: [2005]
Superior document: Contemporary mathematics, 388
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33
Published: [2007]
Superior document: Contemporary mathematics, volume 426
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34
Published: [2007]
Superior document: Contemporary mathematics, 443
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35
Published: [1989]
Superior document: Contemporary Mathematics, volume 97
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36
Published: [2000]
Superior document: Contemporary mathematics, 254
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37
Published: [2000]
Superior document: Contemporary mathematics, 255
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38
Published: [1991]
Superior document: Contemporary mathematics, volume 122
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39
Published: [1984]
Superior document: Contemporary mathematics ; volume 35
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40
Published: [1992]
Superior document: Contemporary mathematics, 134
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