@article { Guarracino1994PEDS,
  author =      "Guarracino, M.R. and Perla, F.",
  title =       " A Parallel Block Lanczos Algorithm for Distributed Memory Architectures",
  journal =     "International Journal of Parallel, Emergent and Distributed Systems",
  volume =      "4",
  number =      "3, 4",
  pages =       "211--221",
  year =        "1994"
  }