@article{SponagelAkbay1984,
  author    = {Sponagel, Stefan and Akbay, U.},
  title     = {{\"U}ber den Mechanismus der Oberfl{\"a}cheninstabilit{\"a}t viskosimetrischer Str{\"o}mungen},
  series = {Rheologica Acta. 23 (1984), H. 2},
  journal   = {Rheologica Acta. 23 (1984), H. 2},
  isbn      = {0035-4511},
  pages     = {185 -- 188},
  year      = {1984},
  language  = {de}
}
@article{SponagelAkbay1984,
  author    = {Sponagel, Stefan and Akbay, U.},
  title     = {{\"U}ber den Relaxationseinfluß auf die Stabilit{\"a}t der ebenen Couette-Str{\"o}mung. Akbay, U. ; Sponagel, S.},
  series = {Rheologica Acta. 23 (1984), H. 2},
  journal   = {Rheologica Acta. 23 (1984), H. 2},
  isbn      = {0035-4511},
  pages     = {177 -- 184},
  year      = {1984},
  language  = {de}
}
@book{Sponagel1982,
  author    = {Sponagel, Stefan},
  title     = {{\"U}ber die Stabilit{\"a}t einer einfachen viskometrischen Bewegung},
  address   = {Darmstadt},
  pages     = {106 S. : graph. Darst., 21 cm},
  year      = {1982},
  language  = {de}
}
@article{SponagelAkbay1981,
  author    = {Sponagel, Stefan and Akbay, S.},
  title     = {{\"U}ber die Stabilit{\"a}t viskometrischer Str{\"o}mungen},
  series = {Rheologica acta. 20 (1981), H. 6},
  journal   = {Rheologica acta. 20 (1981), H. 6},
  isbn      = {0035-4511},
  pages     = {579 -- 590},
  year      = {1981},
  language  = {de}
}