K. Eckert, Guhne, O., Hulpke, F., Hyllus, P., Korbicz, J., Mompart, J., Bruss, D., Lewenstein, M., and Sanpera, A.,
“Entanglement properties of composite quantum systems”, in
Quantum Information Processing,
G. Leuchs and Beth, T., Eds. Berlin: Wilew-VCH, 2003, pp. 87–95.
] 