1
Published: 1999.
Superior document: Memoirs of the American Mathematical Society, number 661
2
Published: 1995.
Superior document: Memoirs of the American Mathematical Society, Volume 113, Number 543
3
Published: [2003]
Superior document: Memoirs of the American Mathematical Society, number 785
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4
Published: [2001]
Superior document: Contemporary mathematics, 271
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