1
Published: 1991.
Superior document: Memoirs of the American Mathematical Society, Volume 90, Number 441
2
Published: 1987.
Superior document: Memoirs of the American Mathematical Society, Volume 67, Number 365
3
Published: 2004.
Superior document: Memoirs of the American Mathematical Society, Number 802
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4
Published: 1996.
Superior document: Memoirs of the American Mathematical Society, Number 580
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