1
Published: 1974.
Superior document: Memoirs of the American Mathematical Society ; number 144
2
Published: 2004.
Superior document: Memoirs of the American Mathematical Society, Volume 171, Number 810
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3
Published: 2001.
Superior document: Memoirs of the American Mathematical Society, number 715
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4
Published: [2003]
Superior document: Memoirs of the American Mathematical Society, number 770
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