If you use the cluster for research that is published or presented in a talk or poster form you MUST acknowledge IBM, NSF and the USDOE for the grants that made the system possible. In addition please send Brett a note with the reference.

An appropriate reference might be:

The calculations in this work were performed [in part] on a IBM workstation cluster made possible by grants from IBM in the form of a Shared University Research grant a NSF MRI grant No. 0079742 and the United States Department of Energy.