@article{StulpeHellwig1983,
  author    = {Stulpe, Werner and Hellwig, K.-E.},
  title     = {A Formulation of Quantum Stochastic Processes and Some of its Properties. Hellwig, K.-E.; Stulpe, W.},
  series = {Foundations of Physics. 13 (1983), H. 7},
  journal   = {Foundations of Physics. 13 (1983), H. 7},
  isbn      = {1572-9516},
  pages     = {673 -- 699},
  year      = {1983},
  language  = {en}
}
@article{StulpeHellwig1993,
  author    = {Stulpe, Werner and Hellwig, K.-E.},
  title     = {A Classical Reformulation of Finite-Dimensional Quantum Mechanics. Hellwig, K.-E.; Stulpe, W.},
  series = {Quantum measurement, irreversibility and the physics of information / Symposium on the Foundations of Modern Physics 1993, Cologne, Germany 1 - 5 June 1993. Ed. Paul Busch},
  journal   = {Quantum measurement, irreversibility and the physics of information / Symposium on the Foundations of Modern Physics 1993, Cologne, Germany 1 - 5 June 1993. Ed. Paul Busch},
  publisher = {World Scientific},
  address   = {Singapore [u.a.]},
  isbn      = {981021507X},
  pages     = {209 -- 214},
  year      = {1993},
  language  = {en}
}
@article{StulpeBuschHellwig1993,
  author    = {Stulpe, Werner and Busch, P. and Hellwig, K.-E.},
  title     = {Classical Representations of Finite-Dimensional Quantum Mechanics. Busch, P.; Hellwig, K.-E.; Stulpe, W.},
  series = {International Journal of Theoretical Physics. 32 (1993), H. 3},
  journal   = {International Journal of Theoretical Physics. 32 (1993), H. 3},
  isbn      = {1572-9575},
  pages     = {399 -- 405},
  year      = {1993},
  language  = {en}
}
@article{StulpeBugajskiHellwig1998,
  author    = {Stulpe, Werner and Bugajski, S. and Hellwig, K.-E.},
  title     = {On Fuzzy Random Variables and Statistical Maps. Bugajski, S.; Hellwig, K.-E.; Stulpe, W.},
  series = {Reports on Mathematical Physics. 41 (1998), H. 1},
  journal   = {Reports on Mathematical Physics. 41 (1998), H. 1},
  isbn      = {0034-4877},
  pages     = {1 -- 11},
  year      = {1998},
  language  = {en}
}