@article{SchelthoffBasermann1995,
  author    = {Schelthoff, Christof and Basermann, Achim},
  title     = {Polynomial Preconditioning for the Conjugate Gradient Method on Massively Parallel Systems},
  series = {Workshop {\"u}ber Parallelverarbeitung : Lessach ({\"O}sterreich), 26.9.-30.9.1994 / Institut f{\"u}r Informatik, Clausthal-Zellerfeld. Klaus Ecker; J{\"o}rg Apsel},
  journal   = {Workshop {\"u}ber Parallelverarbeitung : Lessach ({\"O}sterreich), 26.9.-30.9.1994 / Institut f{\"u}r Informatik, Clausthal-Zellerfeld. Klaus Ecker; J{\"o}rg Apsel},
  publisher = {Inst. f{\"u}r Informatik},
  address   = {Clausthal-Zellerfeld},
  pages     = {150 -- 167},
  year      = {1995},
  language  = {de}
}
@article{SchelthoffBasermannReichel1997,
  author    = {Schelthoff, Christof and Basermann, Achim and Reichel, Bj{\"o}rn},
  title     = {Preconditioned CG methods for sparse matrices on massively parallel machines / Basermann, A. ; Reichel, B. ; Schelthoff, C.},
  series = {Parallel Computing. 23 (1997), H. 3},
  journal   = {Parallel Computing. 23 (1997), H. 3},
  isbn      = {0167-8191},
  pages     = {381 -- 398},
  year      = {1997},
  language  = {en}
}