@unpublished{SchulzeSterninShatalov2008,
  author  = {Bert-Wolfgang Schulze and Boris Sternin and Victor Shatalov},
  title   = {Nonstationary problems for equations of Borel-Fuchs type},
  institution = {Institut f{\"u}r Mathematik},
  series    = {Preprint},
  number    = {(1997) 11},
  year    = {2008},
}