BibTex format
@article{Vedral:1997:10.1103/PhysRevLett.78.2275,
author = {Vedral, V and Plenio, MB and Rippin, MA and Knight, PL},
doi = {10.1103/PhysRevLett.78.2275},
journal = {PHYSICAL REVIEW LETTERS},
pages = {2275--2279},
title = {Quantifying entanglement},
url = {http://dx.doi.org/10.1103/PhysRevLett.78.2275},
volume = {78},
year = {1997}
}