1
Published: 1967.
Superior document: Memoirs of the American Mathematical Society ; number 76
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2
Published: 1974.
Superior document: Memoirs of the American Mathematical Society ; number 144
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3
Published: 1998.
Superior document: Memoirs of the American Mathematical Society, number 628
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4
Published: [1988]
Superior document: Contemporary mathematics, 81
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5
Published: [2021]
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