@article{StulpeHellwig2006,
  author    = {Werner Stulpe and K.-E. Hellwig},
  title     = {A Formulation of Quantum Stochastic Processes and Some of its Properties. Hellwig, K.-E.; Stulpe, W.},
  journal   = {Foundations of Physics. 13 (1983), H. 7},
  pages     = {673 -- 699},
  year      = {2006},
}