1
Published: 1996.
Superior document: Memoirs of the American Mathematical Society, Number 580
2
Published: 1990.
Superior document: Memoirs of the American Mathematical Society, Volume 86, Number 432
3
Published: 2009.
Superior document: Memoirs of the American Mathematical Society, Number 952
4
Published: 2001.
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5
Published: 2003.
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