1
Published: 1984.
Superior document: Memoirs of the American Mathematical Society, Volume 50, Number 306
2
Published: 1996.
Superior document: Memoirs of the American Mathematical Society, Volume 123, Number 589
3
Published: 1988.
Superior document: Memoirs of the American Mathematical Society, Number 389
4
Published: 2017.
Superior document: Memoirs of the American Mathematical Society, Volume 250, Number 1193