@misc{hoefler-anl-colls,
  author={Torsten Hoefler},
  title={{Nonblocking and Sparse Collective Operations on Petascale Computers}},
  journal={},
  institution={},
  year={2010},
  month={Jun.},
  pages={},
  volume={},
  number={},
  booktitle={},
  location={Argonne National Laboratory},
  publisher={},
  issn={},
  isbn={},
  note={},
}