BibTex:

@studythesis{beutel02coorddiscaccesses,
  author = {Bj\"orn Beutel},
  title = {Saving Energy by Coordinating Hard Disk Accesses},
  type = {Study Thesis},
  address = {Operating System Group, University of Erlangen, Germany},
  month = apr  # "~17",,
  year = 2002,
  url = {http://www4.informatik.uni-erlangen.de/SA/pdf/SA-I4-2002-06-Beutel.pdf}
}