@misc{78604,
  keywords = {High performance computing},
  author = {X. Wu and L Zhang and Song. J and D. Chen},
  title = {Preliminary results of GRAPES' Helmholtz solver using GCR and PETSc tools},
  year = {2010},
  month = {2010},
  url = {https://www.ecmwf.int/node/15092},
  language = {eng},
}