@unpublished{KellerRoellyValleriani2013,
  author  = {Peter Keller and Sylvie Roelly and Angelo Valleriani},
  title   = {A quasi-random-walk to model a biological transport process},
  institution = {Institut f{\"u}r Mathematik},
  series    = {Preprints des Instituts f{\"u}r Mathematik der Universit{\"a}t Potsdam},
  number    = {2 (2013) 3},
  year    = {2013},
}