W. Freudenberg.On a class of quantum Markov chains on the Fock space. In L. Accardi, editor, Quantum Probability and Related Topics, volume IX, pages 215--237, Singapore, New Jersey, London, Hong Kong, 1994. World Scientific Publishing Co.
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K.-H. Fichtner, W. Freudenberg, and V. Liebscher.
Time Evolution and Invariance of Boson Systems Given by Beam Splittings.
 In Infinite Dimensional Analysis, Quantum Probability and Related Topics, Vol. 1, No.4, pages 511--531, Singapore, New Jersey, London, Hong Kong, 1998. World Scientific Publishing Co.
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K.-H. Fichtner, W. Freudenberg, and V. Liebscher.
Non-independent Splittings and Gibbs States.
 Mathematical Notes, 64(4):518-523, 1998.
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K.-H. Fichtner, W. Freudenberg, and V. Liebscher
Characterization of Classical and Quantum PoissonSystems by Thinnings and Splittings.
 Mathematische Nachrichten, 218:25 - 47, 2000.
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