@unpublished{AizenbergTarkhanov2008,
  author  = {Lev A. Aizenberg and Nikolai Nikolaevich Tarkhanov},
  title   = {A Bohr phenomenon for elliptic equations},
  institution = {Institut f{\"u}r Mathematik},
  series    = {Preprint},
  number    = {(1999) 18},
  year    = {2008},
}