BibTex format
@article{Valle:2015:10.1007/s00291-015-0392-0,
author = {Valle, CA and Meade, N and Beasley, JE},
doi = {10.1007/s00291-015-0392-0},
journal = {OR SPECTRUM},
pages = {843--867},
title = {Factor neutral portfolios},
url = {http://dx.doi.org/10.1007/s00291-015-0392-0},
volume = {37},
year = {2015}
}