@unpublished{Sadykov2008,
  author  = {Timour Sadykov},
  title   = {Hypergeometric systems of differential equations and amoebas of rational functions},
  institution = {Institut f{\"u}r Mathematik},
  series    = {Preprint},
  number    = {(1999) 33},
  year    = {2008},
}