1
Published: [1979]
Superior document: Memoirs of the American Mathematical Society ; number 225
2
Published: [1976]
Superior document: Memoirs of the American Mathematical Society ; volume 8, number 180 (November 1976)
3
Published: [1974]
Superior document: Memoirs of the American Mathematical Society ; number 138
4
Published: [2001]
Superior document: Contemporary mathematics, volume 288
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