Evolution of cat states in a dissipative parametric amplifier: decoherence and entanglementFaisal A.A. El-Orany, J. Peřina, V. Peřinová and M. Sebawe AbdallaEur. Phys. J. D, 22 1 (2003) 141-156DOI: https://doi.org/10.1140/epjd/e2002-00234-8