1
Published: 1994.
Superior document: Memoirs of the American Mathematical Society, Number 530
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2
Published: [2006]
Superior document: Memoirs of the American Mathematical Society, number 847
3
Published: 1985.
Superior document: Memoirs of the American Mathematical Society, Volume 53, Number 318
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4
Published: [2006]
Superior document: Memoirs of the American Mathematical Society, number 859
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