Analytical solutions and criteria for the quantum discord of two-qubit X-states. - A. Maldonado-Trapp; Anzi Hu; Luis Roa (Quantum Inf. Process., 2015)

Threefold entanglement matching. - Luis Roa; Ariana Muñoz; Alice Hutin; Matthias Hecker (Quantum Inf. Process., 2015)