@misc{Schmidt1999,
  author    = {Schmidt, Hans-J{\"u}rgen},
  title     = {Cercignani, C., Scaling limits and models in physical process; Basel, Birkh{\"a}user, 1998},
  year      = {1999},
  language  = {en}
}
@misc{Schmidt1998,
  author    = {Schmidt, Hans-J{\"u}rgen},
  title     = {Karsinski, A., Inhomogeneous cosmological models; Cambridge, Univ. Press, 1997},
  year      = {1998},
  language  = {en}
}