Progress in Molecular Biology and Translation Science, ISSN 0065-9266 ; Volume 91, Number 447
Print version: Zaks, Joseph, 1940- No nine neighborly tetrahedra exist. Providence, Rhode Island : American Mathematical Society, c1991 v, 106 pages Memoirs of the American Mathematical Society ; Volume 91, Number 447. ISBN 9780821825174
"May 1991, volume 91, number 447 (end of volume)."