@unpublished{MeleardRoelly2013,
  author  = {Sylvie M{\´e}l{\´e}ard and Sylvie Roelly},
  title   = {Evolutive two-level population process and large population approximations},
  institution = {Institut f{\"u}r Mathematik},
  series    = {Preprints des Instituts f{\"u}r Mathematik der Universit{\"a}t Potsdam},
  number    = {2 (2013) 8},
  year    = {2013},
}