BibTex format
@article{Springer:2009:10.1103/PhysRevA.79.062303,
author = {Springer, SC and Lee, J and Bellini, M and Kim, MS},
doi = {10.1103/PhysRevA.79.062303},
journal = {PHYSICAL REVIEW A},
title = {Conditions for factorizable output from a beam splitter},
url = {http://dx.doi.org/10.1103/PhysRevA.79.062303},
volume = {79},
year = {2009}
}