Binegativity and geometry of entangled states in two qubits
Satoshi Ishizaka
Phys. Rev. A 69, 020301(R) (2004) - Published 17 February, 2004
Four-photon entanglement from two-crystal geometry
Yongmin Li and Takayoshi Kobayashi
Phys. Rev. A 69, 020302(R) (2004) - Published 23 February, 2004