The official name for Hydra is the "Smithsonian Institution High Performance Cluster (SI/HPC)". We are working on a formal way to cite Hydra in your publications, but, for the time being, please simply acknowledge Hydra by its formal name in your publications. When you publish a paper that contains work done on Hydra, we would appreciate it if you would let us know so that we can add it to the metrics that we track concerning the use of Hydra.