@article{paperid:1046554,
author = {Akhtarshenas, Seyed Javad and Hamidreza Mohammadi and Fahimeh S. Mousavi and Vahid Nassajpour},
title = {Progress on Quantum Discord of Two-Qubit States: Optimization and Upper Bound},
journal = {International Journal of Theoretical Physics},
year = {2015},
volume = {54},
number = {1},
month = {January},
issn = {0020-7748},
pages = {72--84},
			numpages = {12},
keywords = {Quantum discord; Two-qubit states; Conditional entropy},
}