@unpublished{SchroheWalzeWarzecha2008,
  author  = {Elmar Schrohe and Markus Walze and Jan-Martin Warzecha},
  title   = {Construction de Triplets Spectraux {\`a} Partir de Modules de Fredholm},
  institution = {Institut f{\"u}r Mathematik},
  series    = {Preprint},
  number    = {(1998) 12},
  year    = {2008},
}