The reference to quote if you use GRAPE has now appeared in print.
It is:

L.H. Soicher, GRAPE: a system for computing with graphs and groups, in
"Groups and Computation" (L. Finkelstein and W.M. Kantor, eds.), DIMACS
Series in Discrete Mathematics and Theoretical Computer Science 11,
American Mathematical Society, 1993, pp. 287-291.