@unpublished{LieroLiero2011,
  author  = {Hannelore Liero and Matthias Liero},
  title   = {Testing the acceleration function in life time models},
  institution = {Institut f{\"u}r Mathematik},
  series    = {Mathematische Statistik und Wahrscheinlichkeitstheorie : Preprint},
  number    = {2006, 03},
  year    = {2011},
}