@unpublished{LyTarkhanov2009,
  author  = {I. Ly and Nikolai Nikolaevich Tarkhanov},
  title   = {The cauchy problem for nonlinear elliptic equations},
  institution = {Institut f{\"u}r Mathematik},
  series    = {Preprint},
  number    = {(2007) 01},
  year    = {2009},
}