1
Published: [1977]
Superior document: Memoirs of the American Mathematical Society ; number 187
2
Published: 1993.
Superior document: Memoirs of the American Mathematical Society, Number 482
3
Published: [1973]
Superior document: Memoirs of the American Mathematical Society ; number 133
4
Published: 1995.
Superior document: Memoirs of the American Mathematical Society, Volume 117, Number 558